From the Model Mayhem FAQ:

Why am I not being approved or denied?
If you have not yet been approved, you should first check your My Stuff page to see if you’ve submitted your profile for review! There should be a big red button on your My Stuff page that helps track your progress for submission, and it also lets you know when you’re ready to submit!

If you have submitted your profile and you’ve been waiting a very, very long time (more than two weeks) to be approved or denied, please try contacting moderator to see if they can help you figure out what’s going.