the shadow is to dark, so all the sprite looks as one big dark dot. try to use some lighter colour on shadow or dither it.

Is this for a game? Cuz that would be an awesome game with sprites like this.

The movement of the head doesn't seem in sync with the legs.
Other than that, it's pretty cool.

Wow, I love this! So much detail and movement for such a small sprite. Well done. I could make tiny suggestions like having his shadow move a little with the movement of his legs, or having that front leg come out just a little bit further, but it's really fine like this.

Pretty nice, one comment tough: i think the body should move a bit also (because if the legs are farther apart, the body is a bit lower).