Red Yellow Blue White[1] X Research source

The result should look dark, but that is what you are aiming for. It is easier to lighten the tone. [2] X Research source

Don’t add too much, unless you’re aiming to create a sun burn.

Create multiple skin tones and use the most similar for your painting.

Red Yellow Blue White Burnt Umber Raw Sienna

Burnt Umber Raw Sienna Yellow Red Purple

Black paint can ruin your base quickly. Use black paint in very small increments. Experiment to find your best mixture.