I don't usually comment on the art of games since I could never art myself, but why is it that in the Luna series of games the characters start out interesting looking and with character and then lose the physical details that I like the most about them, the interesting character bits, and become spackled over conventionally 'pretty' doll looking things by comparison? I thought it might be to depict Luna's perception of their sex appeal, but I don't think so after playing the other games. And this version of Luna seems to be the 'pretty' version from where the other game left off.
Dolls are a dime a dozen. Real looking characters make you develop a fetish/appreciation for *that* character, and in the hierarchy of porn catering to a fetish you have > mass appeal.