I see a lot of anatomic issues. Like, Some of your chins are too pointy. Which, If your going for an anime look its fine, I do my shines slightly pointed, but some of yours are kinda extreme.
And the legs on your self portrait are much too large. the left one anyway. The shoulders need a bit of work, too.
THE LEGS OF YOUR ANIMALS. D:
They look like Jell-o. ;( There is no bone structure there. And theres no paws. Which some people prefer that way, and its their style. Just thought I'd throw that out there.
Also, The fact that you dont always do mouths kinda irks me. If you're going for chibi looks, like this
http://i682.photobucket.com/albums/vv187/_Minzor_/ines.png
And..your shading definitely needs some work. ;(
You can look up tutorials for everything on devArt. Including shading. (:
Hope this helped.