Here's his Alabama girl and Arizona girl.
Finally, the averaging process removes asymmetries and other idiosyncratic flaws.But it can't do much for weight other than to skim the cream. I haven't been to Alaska in a long time, but I was surprised a few years ago by how much chubbier Oregon college girls are than California college girls.
Beyond comparing states, there ought to be a lot of interesting things you could do with traits other than location. For example, what is the composite face of a Taylor Swift fan vs. a Lady Gaga fan among white girls 18-22? Republicans v. Democrats?
Victorian novelists used to go on and on for pages about the shape of the noses of their characters on the theory that facial types correlated with personality. This software lets you look for correlations.
Other surefire winners would be to compositize Facebook pictures from rival colleges such as USC v. UCLA, Harvard v. Yale, Smith v. Mt. Holyoke, Notre Dame v. Miami, UC Santa Barbara v. UC Santa Cruz, Cal State Northridge v. Cal State LA, MIT v. Cal Tech, Tulane v. Vanderbilt, and so forth.