Fixing Hands and Faces in AI Images Using GIMP

Hands and faces are where generated images still fall apart. The model learns roughly what a hand looks like, without ever learning that it has exactly five fingers. Fixing that is ordinary retouching work, and it follows a clear order.

Why This Keeps Happening

It is worth understanding, because it tells you which problems will get easier and which will not.

An image model learns from photographs. In most photographs, hands are small, partly hidden, bent, overlapping, and rarely the subject. The model learns the general shape and the general texture. It does not learn to count, because nothing in the training process rewards counting.

Faces get far more attention in training data, so they are usually better. What goes wrong on a face is symmetry. Two eyes generated slightly independently end up looking at different things, and teeth blur into a single ridge.

Technique 1: Crop It Out

Start here. It sounds like giving up and it usually is not.

A tighter crop often improves the composition anyway, because generated framing tends to be centred and static. If the broken hand is at the edge of the frame, cropping is a ten second fix that costs you nothing you wanted.

Use the image cropper with a ratio preset, or the GIMP crop tool with a fixed ratio set in the tool options.

Technique 2: Regenerate With Better Instructions

The second cheapest fix. Compute is faster than your hands.

1. Add a negative prompt: extra fingers, deformed hands, fused fingers, extra limbs.
2. Change what the hands are doing. Hands holding a specific object come out better than hands in mid air, because the object constrains the pose.
3. Ask for hands partly out of frame, in pockets, or behind the subject.
4. Move to a wider shot. Smaller hands mean fewer visible errors.

Technique 3: Clone and Heal

This is the workhorse for extra fingers, stray teeth and small structural errors.

Removing an extra finger

1. Duplicate the layer with Shift+Ctrl+D and name it "repairs". Everything happens here.
2. Zoom to 200 percent. You cannot fix what you cannot see.
3. Take Free Select, press F, and draw loosely around the extra finger plus a little of the background.
4. Select, Feather by 3 pixels.
5. Switch to Clone, press C. Set a soft brush at about 60 percent opacity.
6. Ctrl+click on a clean patch of background near the finger to set the source.
7. Paint over the finger. The selection stops you spilling onto the good fingers.
8. Switch to Heal, press H, and go over the join to blend the texture.

Fixing fused fingers

Harder, because you are adding a gap rather than removing an object. Clone a small piece of background into the middle of the fused pair to create the separation, then use a one pixel soft brush to darken the crease where the two fingers meet. The shadow between fingers is what sells the separation, more than the gap itself.

The clone tool guide covers the basics, and portrait retouching covers the wider set of skin and feature techniques.

Technique 4: Mirror the Good Side

For anything that should be symmetrical, this is faster and more convincing than painting. Eyes are the classic case.

1. Select the good eye with Free Select, taking in a little of the surrounding skin.
2. Feather by 4 pixels, then copy with Ctrl+C.
3. Edit, Paste as, New Layer.
4. Layer, Transform, Flip Horizontally.
5. Move it over the bad eye with the Move tool, press M.
6. Rotate slightly if the face is at an angle, using Shift+R.
7. Add a layer mask and paint black around the edges so it blends into the surrounding skin.

Technique 5: Transplant From a Donor

When a hand is structurally wrong rather than just having one bad finger, rebuilding it is not worth the time. Replace it.

1. Find a hand in a similar pose. Another generation, a stock photo you have rights to, or a photo of your own hand.
2. Open it with File, Open as Layers so it lands on top of your image.
3. Scale and rotate it into position with Unified Transform, press Shift+T.
4. Add a layer mask and paint black over everything except the hand.
5. Blend the wrist join with a soft brush at low opacity, in several passes.
6. Match the colour with Colors, Curves on the donor layer. This step is what makes it invisible.
7. Add the same amount of grain to the donor layer as the rest of the image has.

Layer masks explained covers the masking, and colour correction covers matching the tone.

Fixing Teeth and Eyes

Knowing When to Stop

A useful rule: fix what someone would notice at the size the image will actually be viewed. A flaw visible only at 400 percent zoom in a picture destined for a 600 pixel wide blog post is not worth twenty minutes.

Zoom out to the real display size every few minutes. It is very easy to spend an hour on a detail nobody will ever see.

Common Questions

Why do AI models still get hands wrong?

Hands are small in most training photos, they bend in many directions, and they overlap themselves constantly. The model learns roughly what a hand looks like without learning that it has exactly five fingers.

Is it faster to regenerate than to fix?

Often yes, for a bad hand. Regenerating costs a minute. Rebuilding a hand can cost twenty. Fix when the rest of the image is exactly what you wanted, regenerate when it is not.

What is the fastest fix for a bad hand?

Crop it out of frame. Not every problem needs solving, and a tighter composition is often a better picture anyway.

Can I copy a hand from another image?

Yes, and it is a legitimate technique. Paste it as a new layer, scale and rotate it to match, then use a layer mask to blend the wrist. Match the colour with Curves afterwards.