Anybody who is a member of Renderosity can vote. 

We usually don't vote for our own entries.  On occasion there have only been 2-3 entries, and to avoid the embarrassment of having to vote for our own work, we come to an agreement... like declaring us all winners and a group decision on the next month's challenge.

Because, after all, getting something finished and entered is a victory for many of us.

Carolly