I think this is fairly well known, but the guys at OkCupid keep a blog[1] with their own research regarding how to improve your odds. There is, for instance, an analysis about the relation between attractiveness and camera: [2]
[1] http://blog.okcupid.com/
[2] http://blog.okcupid.com/index.php/dont-be-ugly-by-accident/
I think this is fairly well known, but the guys at OkCupid keep a blog[1] with their own research regarding how to improve your odds. There is, for instance, an analysis about the relation between attractiveness and camera: [2]
[1] http://blog.okcupid.com/
[2] http://blog.okcupid.com/index.php/dont-be-ugly-by-accident/