It sure depends on your taste on how you wish to present your dolls, but over the decades there were releases with really realistic skin, and now you make out of a good skin in Superfly rather then a realistic looking woman a type of Real Doll reproduction ...

Here a sample of a real doll Mandy made of latex ( Guess men love these toys so the renders have to look like them ) So renders might achieve these results by using the superfly engine , honestly not what I would like to have ....