Love the concept of the idea , i find it a bit restricting in a way and i would place restrictions such as these instead of the ones you placed on the challenge;

Create a maincharacter for a game;
-Max polycount(triangles) 3500 -margin until 3800-.
-Can be an existing game character, but an original get's -more points.
-texturemaps maximum of 4 with a max resolution of 1024 pixels.(colormap, normalmap, specular and so on)

No restrictions on look

Final entries must be presented with;
conceptart(only selfmade, if you grab an image from the net you will be disqualified)
wireframe screengrab with polycount
texturemaps
finalrender(can be made with scenery to add to the character).

each of the above can have a minimum of 1 and a maximum of 4 points and in the end there will be a vote amongst members winner of that poll get's another 8 points.

I would also suggest prolonging the challenge to about a month.

I think this way you"ll get more competitors, restricting to a Dali look only would cramp a lot of peoples style