If you don't know this artist, you really missed something out!
Step 1
Open a new document any size and get out a photograph of a random person;
Step 2
Cut him or her out of the background with a tool of your choice;
Step 3
Go to Image>Adjustments>Threshold and choose a setting where you can still see it's a human :P
Step 4
Select the layer and fill it with white on a new layer;
Step 5
Now select the black and white layer and go to Select>Color Range and just click once on the white area and press OK!
Step 6
After just clicking once and pressed ok, press DELETE...
Step 7
Now place the white layer UNDER the black one;
Step 8
And after that just press CTRL+U on both layers and change the colors!
