Here are 3 characters I made today, not game related.
C&C is welcome...
(http://invis.free.anonymizer.com/http://liortamim.tripod.com/3chars.png)
Looks quite good! One rather easy thing you can do is get rid of the artificial corners (such as on the right side of the woman's hair) and double pixels. I'll post a quick edit in a second to show what I mean by double pixels if that's unclear.
EDIT: Okay, I just did a little part of it, it should show what I mean.
(http://www.2dadventure.com/ags/fidodidoremix.gif)
Sometimes i think double pixels should stay...
They can be helpful.
Anyway nice chars...