Now that the colouring of the character has been completed I have begun shading him. I had done this two ways. One method I have used is to have it in blocks, by picking a darker fill colour and using the pen tool to create shapes around objects to gives hard shadows. I have also achieved this by using gradient, but these giver a smoother transition between light and dark. I have used these to make the illustration appear less flat and to give the impression of depth.
Left: Unshaded
Right: Shaded