Where to begin? Well, first, he's an oblong octagon instead of a circle, and the way his cheek blush lines up wiht his mouth in the lower frames makes it look like he's wearing a hockey mask. Then there's the coloring; hardly any of it is pink, and the hues are so varied that his body looks more like it's made of some kind of refractive crystal than a soft, pink, fleshy, um... bubble gum? Balloon? Um... hey, guys? What is Kirby made out of?... Kirbidium! He doesn't look like he's made of kirbidium! The first two poses, I'm not even sure what he's supposed to be doing. You should try doing a basic standing pose before doing any action poses.
[EDIT]
Looks like you updated while I was replying. The colors are better now, but the shape still needs to be rounder.
[EDIT]
Looks like you updated while I was replying. The colors are better now, but the shape still needs to be rounder.