These are all right. I like the first one, and how it focus' on one main subject. The others you can't really determine where the hot spots are. Try centering your photography more, and if you can't just mess around with photoshop.
I would like to give it a try, but can you please choose a render from this site for me? It would be a lot easier on me.
Ps: I had the link go straight to joker renders.
http://planetrenders.net/renders/thumbnail...earch=the+joker