Face-Swap LoRA for FLUX 2 Klein 9B
A LoRA adapter for FLUX 2 Klein 9B fine-tuned for high-quality face swapping. Given a face source image and a body/scene image, the model produces a natural face swap preserving identity, lighting, and skin tone.
Prompt
Use the following prompt for best results:
face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.
- Picture 1: Face source image (the identity to transfer)
- Picture 2: Body/scene image (the target pose and environment)
How to Use
Try it on fal
Open on fal.ai
Via fal.ai API
import fal_client
def on_queue_update(update):
if isinstance(update, fal_client.InProgress):
for log in update.logs:
print(log["message"])
result = fal_client.subscribe(
"fal-ai/flux-2-klein/9b/base/edit/lora",
arguments={
"prompt": "face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. "
"the result should show the exact face and features from Picture 1 on the body, pose, "
"and scene from Picture 2, with natural skin tone blending and matching lighting.",
"model_name": None,
"loras": [{
"path": "https://huggingface.co/ilkerzgi/face-swap/resolve/main/FS2_V2_r32_800_pytorch_lora_weights.safetensors",
"scale": 1
}],
"embeddings": [],
"image_urls": [
"https://example.com/face_source.png",
"https://example.com/body_scene.png"
],
"num_images": 4
},
with_logs=True,
on_queue_update=on_queue_update,
)
print(result)
Evaluation Overview
| Test Cases | LoRA Variants | Image Models | Total Generations | Dataset Sizes |
|---|
| 25 | 9 | 3 | 300 | 300 / 800 |
9 LoRA variants were trained with different hyperparameters and evaluated against 3 image models across 25 diverse test subjects.
Training Configurations
| Variant | Samples | Rank | Steps | LR | Guidance | Avg Latency |
|---|
| V1 r16 (300) | 300 | 16 | 3000 | 5e-5 | 1 | 6.0s |
| V2 r32 (300) | 300 | 32 | 3500 | 5e-5 | 1 | 6.1s |
| V3 r32+cfg (300) | 300 | 32 | 3500 | 5e-5 | 3.5 | 6.6s |
| V1 r16 (800) | 800 | 16 | 3000 | 5e-5 | 1 | 6.4s |
| V2 r32 (800) | 800 | 32 | 3500 | 5e-5 | 1 | 6.3s |
| V3 r32+cfg (800) | 800 | 32 | 3500 | 5e-5 | 3.5 | 6.2s |
| V4 r32 long (800) | 800 | 32 | 5000 | 5e-5 | 1 | 6.4s |
| V5 r64 (800) | 800 | 64 | 4000 | 3e-5 | 1 | 6.4s |
| V6 r32 slow (800) | 800 | 32 | 5000 | 1e-5 | 1 | 6.4s |
Image Models
| Model | Avg Latency |
|---|
| Nano Banana 2 | 28.8s |
| Nano Banana Pro | 33.3s |
| GPT Image 1.5 | 30.3s |
Latency Comparison
| Model | Avg Latency |
|---|
| V1 r16 (300) | 6.0s |
| V2 r32 (300) | 6.1s |
| V3 r32+cfg (800) | 6.2s |
| V2 r32 (800) | 6.3s |
| V6 r32 slow (800) | 6.4s |
| V4 r32 long (800) | 6.4s |
| V5 r64 (800) | 6.4s |
| V1 r16 (800) | 6.4s |
| V3 r32+cfg (300) | 6.6s |
| Nano Banana 2 | 28.8s |
| GPT Image 1.5 | 30.3s |
| Nano Banana Pro | 33.3s |
All LoRA variants average ~6-7s, while image models average ~29-33s.
Model Weights
Test Cases (25)
#1 — middle-aged woman with short stylish grey hair and blue eyes, elegant bone structure
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 6.7s | 8.9s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 7.3s | 6.6s | 6.6s | 6.6s | 6.6s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 35.3s | 39.6s | 27.7s |
#2 — young woman with long straight brown hair parted in the middle and brown eyes
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 6.6s | 6.1s | 7.1s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 7.1s | 6.8s | 7.1s | 9.4s | 6.8s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 24.0s | 32.5s | 44.6s |
#3 — older woman with short white curly hair and warm brown eyes
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 6.1s | 6.3s | 5.9s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.6s | 6.6s | 6.6s | 6.6s | 6.6s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 25.0s | 30.4s | 50.6s |
#4 — young African American woman with braided hair and warm brown eyes
#4 — young African American woman with braided hair and warm brown eyes
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 7.5s | 7.4s | 5.8s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.6s | 6.6s | 7.6s | 6.6s | 5.7s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 31.0s | 36.6s | 28.0s |
#5 — young woman with short blonde bob haircut and bright blue eyes, Scandinavian features
#5 — young woman with short blonde bob haircut and bright blue eyes, Scandinavian features
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.7s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 8.0s | 6.6s | 6.1s | 6.7s | 6.9s | 5.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 26.5s | 41.0s | 25.3s |
#6 — young Hispanic man with wavy dark hair and brown eyes, trimmed goatee
#6 — young Hispanic man with wavy dark hair and brown eyes, trimmed goatee
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.7s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.1s | 7.1s | 6.1s | 6.6s | 6.6s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 25.4s | 42.3s | 24.0s |
#7 — young South Asian man with dark thick hair and brown eyes, short neat beard
#7 — young South Asian man with dark thick hair and brown eyes, short neat beard
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 6.6s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.6s | 6.6s | 6.6s | 7.1s | 7.5s | 7.1s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 23.0s | 31.3s | 25.4s |
#8 — young man with a buzz cut and hazel eyes, tanned skin
#8 — young man with a buzz cut and hazel eyes, tanned skin
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 6.2s | 6.6s | 6.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.1s | 6.6s | 6.6s | 6.8s | 5.5s | 5.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 28.5s | 39.8s | 26.6s |
#9 — young Middle Eastern man with dark wavy hair and olive skin, prominent eyebrows
#9 — young Middle Eastern man with dark wavy hair and olive skin, prominent eyebrows
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.9s | 6.6s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.1s | 7.3s | 8.9s | 6.6s | 5.7s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 25.3s | 44.6s | 66.6s |
#10 — young man with curly black hair and deep brown eyes, clean-shaven
#10 — young man with curly black hair and deep brown eyes, clean-shaven
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 6.4s | 5.7s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 7.1s | 6.1s | 7.0s | 6.7s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 43.9s | 31.3s | 25.2s |
#11 — young African American woman with short natural TWA hairstyle and dark brown eyes, high cheekbones
#11 — young African American woman with short natural TWA hairstyle and dark brown eyes, high cheekbones
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 6.7s | 6.6s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 9.8s | 7.5s | 5.7s | 6.6s | 6.1s | 7.5s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 26.1s | 23.3s | 25.3s |
#12 — young woman with tight blonde curls, dark brown skin, bright smile, dimples
#12 — young woman with tight blonde curls, dark brown skin, bright smile, dimples
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.4s | 10.3s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 5.7s | 6.1s | 6.6s | 6.2s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 30.6s | 25.8s | 25.4s |
#13 — young woman with tight blonde curls, dark brown skin, bright smile, dimples
#13 — young woman with tight blonde curls, dark brown skin, bright smile, dimples
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 7.1s | 5.7s | 7.0s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 6.6s | 5.7s | 7.0s | 5.8s | 6.8s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 24.1s | 24.4s | 26.6s |
#14 — middle-aged woman with dark skin, close-cropped natural hair, elegant gold jewelry
#14 — middle-aged woman with dark skin, close-cropped natural hair, elegant gold jewelry
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 7.1s | 7.5s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 7.1s | 5.7s | 7.1s | 5.7s | 7.1s | 7.1s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 19.4s | 24.7s | 28.1s |
#15 — young Nordic man with platinum blonde hair, ice blue eyes, sharp cheekbones, clean shaven
#15 — young Nordic man with platinum blonde hair, ice blue eyes, sharp cheekbones, clean shaven
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.7s | 6.6s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.6s | 5.7s | 5.7s | 5.7s | 7.5s | 7.1s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 26.4s | 42.2s | 25.3s |
#16 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face
#16 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.7s | 10.3s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.4s | 5.7s | 5.7s | 7.5s | 7.1s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 45.2s | 34.2s | 24.0s |
#17 — young Pacific Islander woman with long wavy dark hair, brown eyes, strong features
#17 — young Pacific Islander woman with long wavy dark hair, brown eyes, strong features
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.7s | 7.1s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 8.1s | 5.7s | 5.7s | 5.7s | 6.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 20.0s | 28.0s | 27.3s |
#18 — older Eastern European man with a thick grey mustache, lined face, piercing grey eyes
#18 — older Eastern European man with a thick grey mustache, lined face, piercing grey eyes
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.9s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 5.7s | 5.7s | 5.7s | 5.7s | 5.2s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 20.7s | 24.0s | 26.7s |
#19 — older African American woman with silver locs, deep brown eyes, and laugh lines, regal posture
#19 — older African American woman with silver locs, deep brown eyes, and laugh lines, regal posture
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 6.2s | 6.1s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 5.9s | 5.7s | 5.7s | 5.7s | 6.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 25.7s | 58.2s | 24.8s |
#20 — older Chinese woman with jet black dyed hair, round face, gentle brown eyes, pearl earrings
#20 — older Chinese woman with jet black dyed hair, round face, gentle brown eyes, pearl earrings
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 6.6s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.8s | 5.7s | 5.7s | 7.1s | 5.6s | 5.6s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 35.0s | 27.9s | 28.3s |
#21 — middle-aged woman with fiery red curly hair and freckled pale skin, green eyes, strong jawline
#21 — middle-aged woman with fiery red curly hair and freckled pale skin, green eyes, strong jawline
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.6s | 5.7s | 5.6s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 5.7s | 5.7s | 5.7s | 6.6s | 5.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 41.1s | 36.6s | 27.9s |
#22 — young Southeast Asian man with black hair, smooth brown skin, sharp jawline
#22 — young Southeast Asian man with black hair, smooth brown skin, sharp jawline
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.7s | 5.7s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 5.7s | 6.6s | 5.7s | 5.7s | 5.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 25.3s | 28.8s | 25.3s |
#23 — middle-aged woman with natural grey afro, dark skin, reading glasses on nose
#23 — middle-aged woman with natural grey afro, dark skin, reading glasses on nose
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 6.6s | 5.7s | 5.7s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 6.1s | 5.7s | 5.8s | 5.6s | 6.6s | 5.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 34.1s | 22.0s | 24.6s |
#24 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face
#24 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 5.6s | 5.7s | 6.1s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 7.8s | 5.7s | 5.9s | 5.7s | 5.7s | 5.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 31.9s | 24.7s | 26.0s |
#25 — older East Asian man with thinning grey hair, wire-rimmed glasses, kind wrinkled eyes
#25 — older East Asian man with thinning grey hair, wire-rimmed glasses, kind wrinkled eyes
| Face Source | Body / Scene | Ground Truth |
|---|
 |  |  |
LoRA — 300 Samples
| V1 r16 (300) | V2 r32 (300) | V3 r32+cfg (300) |
|---|
 |  |  |
| 6.6s | 5.7s | 6.0s |
LoRA — 800 Samples
| V1 r16 (800) | V2 r32 (800) | V3 r32+cfg (800) | V4 r32 long (800) | V5 r64 (800) | V6 r32 slow (800) |
|---|
 |  |  |  |  |  |
| 5.7s | 5.7s | 5.4s | 5.7s | 5.7s | 5.7s |
Image Models
| Nano Banana 2 | Nano Banana Pro | GPT Image 1.5 |
|---|
 |  |  |
| 25.3s | 37.3s | 46.7s |
Training Details
- Base Model: FLUX 2 Klein 9B
- Method: LoRA (Low-Rank Adaptation)
- Trainer: fal-ai/flux-2-klein-9b-base-trainer
- Datasets: Two custom face-swap paired datasets (300 and 800 samples)
- Rank variants tested: 16, 32, 64
- Training steps: 3,000 – 5,000
- Learning rates: 1e-5 to 5e-5
- Guidance scale: 1.0 and 3.5
Author
Ilker Izgi — Creative Engineer at fal