Though there is an effect specifically designed to create Andy Warhol screen prints from your photographs, there is another way of doing it. This is called the Color Reduction effect. Here are some examples, all taken from the same photograph, which is shown on the left below:

The Color Reducer effect is different from the purpose designed Warhol effect because it does not repeat the images for you. Another difference is that the program tries to match the colors as best it can with the palette you have given it. You can choose up to 36 colors, and decide what tha actual colors are. Here is the dialog box:

Here are a another two examples:

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