Pop art picture done by taking a portrait opening it up on photoshop, then going to Image>Adjustments>Posterize and changing the number to something around 4. Then taking the Magic Wand Tool and selected a certain gray area and then opening up a new layer and painted into the selected area. I did this for all the 4 gray, black, and white areas for each picture. Then I saved them all, opened them into a new canvas file and then placed them all down.
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Pop Art
