First of all, I'm no walk animation expert, but the readability is terrible. i would start with simple colors till you get it right, like this: (Really fast drawing)

then, i think it needs some more frames. a little jumpy right now. you might want to redo the whole thing, no offense.
heres a great tutorial:
http://www.idleworm.com/how/anm/02w/walk1.shtmlheres a insanely quick walk render:
my animator is broken, sorry i cant get you a .gif

Otherwise, very good job. i like him, he has personality.