I think 9 colours is a bit much for such a simple sprite. And for a simple character like Kirby, you could have done a smoother and more complex animation.
I think that pink you're using as the shadow on his body has too much contrast. You could try making that shade lighter, or just get out a new shade (since it doesn't seem you're going with a low resolution).
As for the animation, I find it odd how his body moves, but his arms don't. You could have them flap out to the sides just a little. And since it's just 2 frames, it might be nice to see a blinking animation added into the whole idle animation.
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However, I'll fix up the other problems.