Graphic novel? How do you maintain consistency between different images? When you generate two images with different settings but with the same character inside

Graphic novel? How do you maintain consistency between different images? When you generate two images with different settings but with the same character inside? Or do you not generate full images? I've read that one technique is to generate a character sheet, and then using traditional graphics editors to paste the characters onto images of different settings. But that may not be a good fit.