I've been playing with AI generated tilesets and background images myself. Can you give me a few examples of what the imperfections you are referring to and what to look out for?
Viewing post in Free Isometric Tileset CC0 For Prototyping comments
As you can see, there are flaws in the roof of the houses and in the hands of the characters. Hardly any image will come out perfect. You can usually get better results with people's faces, but for game assets I don't get such perfect results. But if you look at it from afar, it's hard to notice these imperfections.