well... the only thing that put me off is her face, it just turns me off. her face should add to the player's arousal and horniness, you get what i mean ?
ofcourse, i'm sure you have plans on improving that. she needs to look ... beautiful, pretty or cute ( depends on how you wanna shape the character ) to attract the player.
maybe the boobs could be a bit more ... realistic ? they look a bit too much larger than needed.
other than that, the first pic is quite good ( and arousing
) , butt-cheeks need to be a bit level though. ( small detail )
looking forward to a few more renders before you finalize the art and i wish you good luck with the game !