I Lik this, but I feel like you have too many colours going on. I often attempt to limit myself to say 8 colours. I usually pick one for light and one for dark of each. Even with larger colour pallets It's best not to over complicate.
Viewing post in The Obligatory Pixel Art Thread
I think Broegan may be right, not less colors, but less tones of the same color? The gradients make it kinda muddy, if that makes sense, especially with your muted colors. The pose is great though, I always have trouble posing my characters, and this conveys a lot of action and personality :D
-CuddlyColin