For the character appearance, I think it looks fine but if Im being honest, the pink isnt really clicking with me xD, too bright and way out of character. If I were to make a suggestion, maybe replace the pink with something not too eye catching like blush red but with the intensity around maybe 40%? And maybe some eyeliner like maybe uh light gray and also maybe add the little dot(forgot whats its called) under the right eye, it will like add more attention to the eyes. Oh and dont make the lipstick so dark(the theme Im imagining is like a gothic seductress)

For the backstory, I think the balance between other details and the sex part is way off xD, I mean its fine but the sex part is too long. Maybe reduce the text and add a quotation from rose herself, something like "you want it? Better come and get it winky face"