Help in need of C+C

[Mabelma]

The problem with the shading is that it's not rounded. The shading should be following the shape of what it's being shaded. Ball = rounded shading. It also lacks transitition bewteen one color to another one. Look at the ball guy and you can see that his shading has another color bewteen the dark blue and the mid blue same happens for the mid blue and the light blue.