they rly don't at all, maybe sometimes, but not like you want to be, HE culture is the same culture of BE
maybe not much now since HE are just being absorbed by human culture, but that have nothing to do with body paints
lets just ignore the fact that body paints IS part of their overall culture, cause they did that in the second warSure, blood elves can paint themselves, but that's not part of their overall culture, so it wouldn't be available to them.
bodypaints don't make a different race, neither make then different enough to be an allied race, even more in the other action