Oh I should have added that I know the art style is completely subjective. I'm not saying you actually need to change it, but just something you can consider. I understand that an art style could be something important to an artist, and they would want to portray their ideas in a certain way.
I actually don't know much VNs to really give an example like that, and honestly idk what exactly is a style I think is appropriate. Maybe it's not necessarily changing the art style but just putting some more details to the backgrounds or even characters to make them a bit more realistic. I do think how it looks like right now has a certain charm to it tho. What I said is really just a personal preference more than anything, I don't wanna disrupt you as an artist.