Very very nice! I really like the feel of it ^^ Normally i'd say that mixing brushes into a fully (for the most part) vectored piece to be a bit of a mismatch as things will have trouble matching up nicley.
HOWEVER this time it's different. The brushes and the vector meld nicley together so i can only crit one thing and one thing only. That being the marble floor which i feel is too bright for a nightime setting if that could be made darker then i would say this is perfect! I wish you luck on the contest and i hope you win.
Gonna fav this one too while i'm at it too.