Yes, it's called reborning, people paint the bare vinyl doll kits using various tools and techniques and try to get as much realism as possible-- it's amazing what some of them can do!!
I sculpt these just using Sculpey flesh-colored polymer clay-- I sell the unbaked sculpted head to the doll factory and they bake it in a kiln and then make a rubber mold and then metal molds for pouring the vinyl-- we do all of it right here in Midland, MI when most companies get their dolls made in China--
no art school-- I've just always fiddled around with art stuff--and just decided a few years ago -- I think 3 or 4-- that I wanted to sculpt--