Well.. umm.. how about we make it weekly.
so each week a different challenge.
The first three weeks will be the simple challenges, the best artist each week will be selected.
So we'd have three best arts (and artists) of the month.
Next, in the final week, The three compete against each other.
The best art will be decided by poll.
and that guy will get to be the month's champion artist.
Edit: Oh-ho, what about a Chakra-Beast?