There’s a few things I’ve generally seen AI image generators struggle with. Hands and feet have been mentioned, but some of the tools I’ve seen struggle with things like bow strings. I’ll see if I can find an image someone in my PF2e group generated, but one of the characters is a magus that favors using a bow so the prompt was for something like an archer firing magical arrows and no matter how he tweaked the prompt, the tool could not get the string on the bow to look remotely right. The arrow the archer had nocked kept being positioned at an extremely weird angle too. Maybe it was an issue of the prompts he was using.