On a broader point though, the human taste for "average-looking" faces is an interesting one. Aside from anything else it's an interesting Nash equilibrium -- I want to find a mate with an average-looking face so that we can produce children with average-looking faces who will be the most desirable breeding partners in the next generation.
What I really wonder is whether "average-looking" is hard-wired in, or whether we're programmed to spend our childhood scanning all the faces around us and mentally averaging them out to determine what a human face should look like. I suspect the latter -- it's a much more stable strategy over evolutionary timescales, and also explains things like why people often find people of their own race more attractive, and why mixed-race people are often unusually attractive.