I have to agree with n0 on this. He does have a Chip n Dale look to him, and it's adorable. Very good.

But as far as constructive criticism goes, it wouldn't hurt to look at examples of leg structure and anatomy. Or anatomy in general, actually. Getting a firm grasp on the stuff early on will help you to grow rapidly as an artist.

btw- that photo of your "new hamster" in your gallery.. probably the cutest freakin' hamster i've ever seen.