A Dogū (土偶) left and an artist’s impression of how a prehistoric Japanese male might have looked
 
We check our Search Engine Box daily and are often surprised (and delighted) by some of the search terms that bring people here. What did prehistoric Japanese people look like? appeared in our Search Box yesterday and, although we don’t have much information to offer, the above illustration might be of interest (sorry but we don’t have a source for its origin).
 
Also of interest may be The Prehistory of Japan by Gerard J Groot.