Cell-shade your pictures
Open up a picture you want to cell-shade;

First select all the parts that have the similar color (I used Black first);

You must use the "Polygonal Lasso-Tool for this all;

When you select one color, make a new layer and just fill it with that color; (You can use the eyedropper for the color)

When you're done, you should have A LOT of layers with all different colors;

It is a lot of work, but it pays off...
REMEMBER: You don't need to use EVERY COLOR, just the basic, the shadow and the shining-part
Check out below how the Polygonal Lasso-Tool works;






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