Its a question many do have about themselves and most of the comments on their pics are trying to be helpful, not harmful. Also, if that thread weren't there, could you imagine how often someone would post their own topic asking what others thought, if they pass or not? Be lots of threads, me thinks(which honestly hurts my head by the way).
And as Jill said, no one is forced to post their pic there, but if they wish to see what others think and if someone has suggestions, then what's really the harm? No skin off my nose or yours really. Unless you're sitting really too close to your monitor and getting screen burn...