These are cool, the left and bottom characters sort of remind me of The Baskervilles, animated tv series. The hands on the guy on the left look very nice, but the cigarette hand on the guy on the right looks a bit odd. I think it's either the fact that you can't see the butt of the cigarette poking between any two of his fingers, and that the pinky finger looks quite small. Also try to give the pinky finger a "flat" tip like the other fingers instead of a pointy tip.
Consistency. It's just me being a gasbag and nitpicking but every little helps.