Random turtle sprite ala Me
 

http://home.1asphost.com/NateRR/Leo.gif ... yup, I made it myself, submited it to the official site (wish me luck) Coments and critiques are welcomed :)

Computer graphics like this really is my area :)
On another forum where I'm active, I'd say more shadings. Quite simply it means you should use more shadow and light effects to form the body.
If you also give him a more "I'm ready to fight " pose, it'll become bad-ass (well, a little more work needed).

I think it's good. I like doing those little sprites too (only I call 'em cartoon dolls.) :D

And I call them avatars! :P

Looks good, dude! I do agree with Deepflame though. Looks like Leo could be a little more dramatic. But you can try doing that in the next sprites you make. :D

you should make a little collection or series or something! that'd be cool.