I don't like gigantic tits that make it look like they are gonna tip over. Other than that it depends on the character, if it's a right fit then it's good.
I've tried to make stories with AI and it's hard, you make some lora to get consistent faces and controlnet to get some control over poses but there is still a lot of inconsistency in backgrounds and getting the composition right is really hard. I'm sure it will improve soon as the technology is...
When I first started playing VN's I didn't like Ren'py that much but it grew on me and I don't really remember the issues I had with it. Now if I play a non-renpy game I get annoyed if they did not copy the way ren'py does things.