How to Fix AI Hands Without Regenerating the Face
A region-edit skill to fix AI hands without regenerating the face. Mask only the hands. Keep the same seed and face lock. One lighting hex if the skin shifts. ChatGPT image, Flux, or Midjourney vary-region. Not a full portrait reroll.
Anyone who already likes a portrait except the fingers can fix AI hands in one sitting: mask only the hands, keep the same seed and face lock, generate the region once. Do it in ChatGPT image, Flux, or a Midjourney-style vary-region before a full reroll gives you a stranger with better knuckles.
Hands are a local problem. If you regenerate the whole frame, you started a new casting session.
This is a specialist cut of the three-pass image revision loop. Use that when the whole picture still owes you a pass. Use this when the only unpaid debt is the fingers. Keep the person locked the way you keep a character consistent across prompts.
Fix AI hands without a full reroll
1. Freeze the face and the seed before you touch a brush
Write the freeze on paper: who, crop, wardrobe, expression, the seed or face lock your tool already used. Do not improve the prompt while you copy it.
If you never saved a seed, save the image ID now. In ChatGPT image, keep this still in the same chat. In Flux, attach that still as the only reference. In Midjourney-class tools, vary the region of this frame, not a cousin in the grid.
If the original prompt was a pile, rebuild the freeze with the three-layer image prompt structure and park the hands as their own layer.
2. Mask only the hands
Paint the mask over the fingers, palms, and a thin wrist margin. Stop at the cuff. Do not include the face, hair, or the second person in the shot.
A generous mask feels safer and is how a new jaw arrives. If the hands cup the face, fix the far hand first. Leave a good hand unmasked. The model will "balance" a pair you did not ask it to touch.
3. Prompt the pose, not a better hand
Inside the mask, describe what the hands are doing, in the same light as the face.
"Left hand resting on the table edge, four fingers visible, thumb tucked, skin matching the face, no extra digits, no jewelry unless already in the freeze."
Banned: perfect hands, elegant fingers, beautiful, new nails, new rings, a new gesture. Do not ask for "better hands." Better is a reroll. Ask for a count and a pose.
If the tan drifts, sample one hex from the cheek — #C9A17A is the idea — and add: "skin hex matches the face, same key, no new rim." That is a color lock, not a lighting rewrite. A new key is changing only the lighting, a different job.
4. Generate the region once, with the face lock on
Run the inpaint or vary-region. Same seed. Same face lock if the tool has one. Do not upscale in the same click. Do not switch aspect ratio.
ChatGPT image will restyle the shirt. Flux will soften the arm. A fat mask will bleed. Reject any frame where the eyes, mouth, or hairline moved.
Check digit count, overlap, skin hex, then the face. If the face moved, roll back. Do not crop in the new hands.
5. Three tries on the same mask. Then stop
If the first region is wrong, do not widen the mask. Shrink it or name one finger that is still fused.
Second try: same seed, smaller mask, shorter pose line.
Third try: same seed, describe the contact point only — "index finger on the cup handle, other fingers curled."
After three, stop. A fourth try with a new seed is a new portrait. Save the freeze, the hex, and the mask rule. Next time the knuckles fail, you do not reopen the face.
Reusable skill card
Trigger: You like the face in a portrait and you are about to hit regenerate because the hands are wrong.
Input: The approved still, the seed or face lock, a mask over hands only, a pose line with a digit count, one skin hex sampled from the face if the tan drifts.
Output: One region edit. Face, hair, crop, and wardrobe unchanged. Hands match the freeze and the hex.
Stop: After one good region, or after three tries on the same seed. No full reroll. No new jewelry. No lighting rewrite in the same pass.
Takeaways
- Mask only the hands. A mask that licks the cheek is a new face.
- Keep the seed and face lock. A new seed is a new person.
- Prompt a pose and a digit count, not better hands.
- Lock one skin hex from the face if the tan shifts. Do not restage the light.
- Three region tries. Then stop.
Frequently Asked Questions
Can I reroll the whole image if the hands are that bad?
Not if you already like the face. A full reroll is a new person. Mask the hands. If the tool cannot region-edit, pick a tool that can.
How large should the mask be?
Hands plus a thin margin of sleeve or wrist. Not the forearms. Not the face. A mask that licks the cheek is how you get a new jaw.
What if ChatGPT image restyles the whole shot when I ask to fix the hands?
You asked it to redraw. Switch to a region edit, or paste the portrait back and say edit only the masked area. Do not chat a new prompt from scratch.
Do I change the lighting while I fix the hands?
No. Lock the existing light, or lock one hex from the face. A new key on the hands is a new shoot. Lighting is a different pass.
How many inpaint tries before I stop?
Three on the same mask and seed. If the fingers still fail, shrink the mask or describe one pose, not a better hand. A fourth try with a new face lock is a reroll in costume.