Mostly the stripes and claws. The largest claw need only be one pixel at that size, yet yours is 3, and the stripes serve only to confuse the shading.
The sprite you currently have is a completely top-down one, by the way. If you were to attempt something at more of an angle, you'd be concentrating more on shaping the front of the raptor, not the top.
The sprite you currently have is a completely top-down one, by the way. If you were to attempt something at more of an angle, you'd be concentrating more on shaping the front of the raptor, not the top.