Looks a little rushed.

I laughed! But I think you should go for less blurry shading and a darker one. It also seemed a little rushed. But I do love the bunnies expression. And I agree with JQB on the background, sorry.

But I did laugh! :D

funny design

but a bit messy in the shading. Like savory Im no big fan of the bg.
Id suggest not using black and white for shading. rather: pick a darker saturated shade of the color; that should look better.

Blargh

eh I actually kinda like it, except for the background. Is that a smudge or smear tool? I would use that very sparingly. Have you ever checked this guy's tutorials out?

http://www.itchstudios.com/psg/art_tut.htm

It helped me out quite a bit, although all you really need is time and practice.

Omg blood!

For some reason he looks rushed. Plus that blurry red background just gives it away. I know you can do much better than that. But what I like is the bunny's expression. Even after death he managed to keep a goofy smirk. "May you rest in pieces"