Small perky tits on petite girls. Normal round tits, but without sagging tits on average and fit body types. Bigger tits that do not defy gravity on thicker girls
Having said that, if it looks like the character is constantly experiencing debilitating back problems, no. That suggests that the dev got their knowledge of eroticism from watching hentai.
anything before mega size works great, then there is a point where massive tits go from attractive to eldritch horrors. i found out that critical point is not quantifiable