Well, this is ages old, but anyway:
Cujo, I believe your poses look too static. Your first picture, for example, it's arms are just dangling there, and it looks really awkward, and the back legs placement next to the tail, the depth there is wrong. I think the legs need to be moved around slightly.
The second image, I believe, doesn't show the character enough, I'm guessing it's supposed to be jumping, but it doesn't look like a powerful anime-style leap. I believe the shield hides too much of the character, and bogs down the image overall.
On the plus side, the drawings are neat, and you don't have disproportionate limbs on your characters. I'd recommend you work on your poses a little more.