SinnerMan - Man, your background is badass. So's that weapon. Think his legs look a bit short, though.
SpasmMan - Cute, but doesn't really seem post-apocalyptic. It also feels a bit flat, like each piece is lit individually, but the figure as a whole doesn't quite gel together? Especially on the white areas. Finally, the smoke looks much too solid, and the black outline isn't helping.
jrbarker - I think you're having trouble with his legs - the bent leg makes it look like he could topple right over. If you want to keep it bent, at least move his feet apart a little?
Progresssssss. Starting to realize how little I actually know about lighting environments. Any crits would help!