Tutorial: Pop art

Hello once again.
Today I'm going to show you how to make this effect.

I've seen quite a few ways to do that, but I think this is the most creative one.
Let's get started.
Open your stock image. I will be using this one.

Start with selecting the person, so you can delete the background. I will be using the Pen tool.

When you've selected the person, press Ctrl+Shift+I to invert the selection. Now press Delete. After that press Ctrl+J to duplicate the layer.
Now just press Ctrl+Shift+U to desaturate it. You should get something like this.

Now press Ctrl + M to change the curves. Try to get something like this.

Now go to Filter>Sharpen>Unsharp mask. Get a moderate effect, don't overdo it.
We want to keep our shadows so we get an effect closer to the Andy Warhol's.  To do that go to Select>Color Range. Select Sampled Colors and Selection and click on a dark spot in the picture.

Now create a new layer. With the selection active, paint it black using the Alt+Enter with black on background.

 

Now make the layers invisible, except the original one. Select one part of the body with your selection tool. You don't have to select it perfectly, it'll do fine if you don't exactly follow the lines. After you have selected it use the Paint Bucket to fill the selection. Use any color you like and make sure it's on a new layer.

Do the rest of the body parts following these steps.

After that merge all the layers containing the colors.
Create a new layer. We're going to make the square pattern. Fill the layer with white and go to Filter>Sketch>Halftone Pattern. Set the setting like this: (set the colors to white-black)

And the last step is to add some noise. On the dotted layer go to Filter>Noise> Add Noise. Set the settings like this, set the blending mode to multiply and fill around 20%.

 

Make sure your layers are like this (from the top): Shadows, Dot patter and Color. You should get something like this.

You can change the colors with Ctrl+U.

And that's it. A simple effect that looks really cool.