It’s a simple command, but great for illustrative effects
First, we’re going to deal with the background. Simply head to Filter>Filter Gallery>Artistic, and go to the Cutout option. We want the background to be low in detail, to draw the attention to the subject, so use Levels: 2, Simplicity: 6 and Fidelity: 2.
Open your subject. Select the subject using a Quick Selection. Ctrl/right-click and then choose the Refine Edge option to iron out any edges – don’t worry too much about this, though.
Click the Mask icon, and go to Filter>Filter Gallery. Choose Cutout again, and use Levels: 2, Simplicity: 0 and Fidelity: 2 for more detail than before.
Duplicate your layer of the original document by Ctrl/right-clicking. Position your subject and go to Enhance>Adjust Colour to change the colour if you want. You can adjust everything as a whole on a layer with Hue/Saturation and individual shades with Replace Colour.