This is super creepy, but interesting nonetheless.
From Lovelyish:
Researchers claim that the perfect face is the most average face. More specifically, it's the ratios, between the eyes, and from the mouth to the eyes that determines attractiveness. Women in photos were perceived to be the most beautiful when the space between the pupils was just under half (46%, to be exact) of the width of her face from ear to ear. Also, when the distance between the woman’s eyes and mouth was just over a third (36%) of the overall length of her face from chin to hairline. Some celebrities who have this ratio include Jessica Alba, Liz Hurley and Shania Twain.
What I found even more interesting was an experiment attempting to create the most beautiful woman in the world using Photoshop. They took 16 of the most beautiful faces, separated them into groups of four, and took the average of each group to create the average of the averages. Here's what it looked like:
Presumably they could do the same thing with other races, or if they wanted the ultimate, they could mix all the races.