...This is quite possibly a snapshot of your brain...
Dude. These are a lot of fun. I really like the angles and the colors are awesome. Your characters are nice as well.
I think these are pretty cool. The city environment is in a different league though. The color has more sophistication than the others. Definitely worth playing around with it more!
the city scape is my favorite too. Just put a little more saturation here and there. I like that the characters are more appealing.