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For the best results, turn the fixation down to zero, and the caps to 1 (but it looks fine without the caps), so it will look like a normal drawing tool. Use this to draw the outline of your drawing, for example, a shape similar to Sonic the Hedgehog's head. Fill it in with any choice color using the
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http://i.imgur.com/AZK5Q.png
For cartoon style shading, select several colors lighter and darker than the base color you already used, then turn the pen mass down to one and the mass up (if you haven't already) and draw guide lines for the shading, it doesn't matter if they go off the drawing, we'll be erasing them anyway:
http://i.imgur.com/SL7zD.png
Now fill them in with the
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http://i.imgur.com/3gX5E.png
Now do any last tweaks you might need to do, and your done! (To erase things going over the border that shouldn't be, just copy the border, erase it then paste another one in the same place as the original.)
http://i.imgur.com/ZPqkL.png