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^{1Blake. (2022). With the right prompt, Stable Diffusion 2.0 can do hands. https://www.reddit.com/r/StableDiffusion/comments/z7salo/with_the_right_prompt_stable_diffusion_20_can_do/} . 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.