Fix Deformed Generations

Deformed generations, particularly on human body parts (e.g. hands, feet), are a common issue with many models. This can be dealt with to some extent with good negative prompts. The following example is adapted from this Reddit post.

Example

Using Stable Diffusion v1.5 and the following prompt, we generate a nice image of Brad Pitt, except for his hands of course!

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Prompt

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studio medium portrait of Brad Pitt waving his hands, detailed, film, studio lighting, 90mm lens, by Martin Schoeller:6

Using a robust negative prompt, we can generate much more convincing hands.

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Prompt

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studio medium portrait of Brad Pitt waving his hands, detailed, film, studio lighting, 90mm lens, by Martin Schoeller:6 | disfigured, deformed hands, blurry, grainy, broken, cross-eyed, undead, photoshopped, overexposed, underexposed, lowres, bad anatomy, bad hands, extra digits, fewer digits, bad digit, bad ears, bad eyes, bad face, cropped: -5

Using a similar negative prompt can help with other body parts as well. Unfortunately, this technique is not consistent, so you may need to attempt multiple generations before getting a good result. In the future, this type of prompting should be unnecessary since models will improve. However, currently it is a very useful technique.

Notes

Improved models such as Protogen are often better with hands, feet, etc.