As a representative for the Southern Hemisphere, I'm going to have to disagree with the seasons thing. I think the theme should be "seasons" rather than a fixed season.

There will be a prize system that will work with points,

I read "points" as "pants." I lel'd.

Question: What is "editing" referring to? o: Also, I think that there should be a thread where people post suggestions for themes. It would be good if the contestants could choose what they're gonna draw. Or at least give suggestions.

Monthly contests sound good though! Nice thinking. :] I'd be happy to be a judge at some point!