Seperating beginners from the rest.

[Omegakyogre]

I think the beginners/experienced distinction can be easily handled the same way as Custom submissions are handled: If it's your first time, you have to post in the beginners section, and if it's up to snuff, you get told by a mod that you're allowed to post in the experienced section. If it isn't, then you get critiques for your work in the beginners section and you can work more on it there until you work your way up to Experienced.