In promotion details we can clearly read, that you have to take your OWN photo while on tilt. As we could see in that thread, some ppl posted pictures which can be found on the Internet, which, first of all, isn't fair, and secondly, it's against promotion rules.
Unfortunately sometimes we can't tell if it's a real photo or not. Even PS staff chose at least one photo which isn't real, in this news: http://www.pokerstrategy.com/news/content/One-Week-Left-to-Show-Us-Your-Tiltiest-Picture-and-Win-Hold-em-Manager-2_67853/

Maybe you should post your real photo?
This picture can be found on the Internet. Here is another pic of that guy:

So, my suggestion is simple: winning pictures should be verified.
Winners should send their valid document with photo, such as ID, driving licence, passport.