Maybe on the right ? I would like something a bit more on the right, not sure, but something is missing.
I think you should add a border. It kind of cleans up things on the edges. EDIT: Whoops, damn dark background didnt make it look like there was a border, ignore that then. lol
not bad but i think it lacks a bit of depth, try sharpening the actual render itself it ould look much better and the lighting should be a lot stronger.The black bit on the right where its jus dark and black looks wrong maybe increase the effects there or so.
Pretty nice, man. But you should create a B&W gradient map overtop and set it to luminosity to bring out more contrast and depth.