usually in these contests brushes and textures are not expected to be original. if they were then you really couldn't use adobe photoshop to manipulate drawings and photos and they always want to make that tool available. using poser or daz though i'm not so sure they really want that. i can understand though how an art community of modelers might get miffed that a contest that they are promoting should allow the use of unoriginal meshes. which ofcourse is something that they work very hard to create and as someone said is an art form in and of itself. still this looks like it might get to be a standard restriction which i think would be a great slight to poser artists.  

Computer Art by Charles McChesney