I really liked the overall look of this model once i saw it, but as people has been saying, the animations need a bit of improvement.
the stand ready animation is good as it is (i really like the flow of the ears, nice detail there), but in the stand animation, i think his whole torso has to move, not just the separate components.
The stand - 2 anim.. well, what can i say. i totally lol'ed as soon as i saw it. Surely, it breaks off amusingly from the regular stand. Make him do something more than just wave his arm roboticly.
In the other animations, just make sure you add more motion. The death animation looks all like "Uh, imma lay down here for a while and rest", or maybe, "oops, banana shell!". More motion to his arms, chest, and head.
Finally, in the attack animation, it looks as he is doing a lot of movement with his arms, but his body in general is not moving that much. Make hos torso move back and forth as he redistributes weight to strike the blow.
Everytime you are about to start an animation, just stand yourself on the floor, and try to imagine how it will look.
When you have it somewhat figured out, try to replicate it with your movements a few times, and everytime, you focus your attention on a new body part.
Always think: how does my back move when i do like this? In what direction does my knees go when i crouch like this or run like that? Just look at the bones on your model and make sure every one of them has a few keyframes in each animation.