Good gracious me, most of those photographs aren't very flattering. Some of them look like aliens.
Anybody can look bad without make-up, but I think it plays a big part in supermodels' success: a lot of them look really unhealthy and unattractive without make-up, but have the features and proportions that make them look good once made-up and / or Photoshopped. I know even if I was Photoshopped I would still look ridiculous if I wasn't to drastically change my face and look like a completely different person.
Emily DiDonato looked adorable without make-up, though, I must say.