Quick edit to showcase things I know I'll poorly explain.
The two most important things I changed were the left arm and foot. I rounded out where the arm meets the body to showcase Kirby's spherical proportions and I changed the foot to better connect with the body, as well as the shading to be better affected by the source of light.
Oh, and I also, to try and add a little more depth, completely filled in the opposite limbs with the darkest color appropriate to that specific part.
The two most important things I changed were the left arm and foot. I rounded out where the arm meets the body to showcase Kirby's spherical proportions and I changed the foot to better connect with the body, as well as the shading to be better affected by the source of light.
Oh, and I also, to try and add a little more depth, completely filled in the opposite limbs with the darkest color appropriate to that specific part.