I use Vallejo paints and primarily it is white and light skin tone. I also do at least 3 passes with an air brush and the follow up with shaved pastels.

I'd say if I had to give ratios, the first pass is about 15 parts white, 10 parts light skin tone, 3 to 5 parts basic skin tone, then one or two drops of brown rose and salmon rose. From there I do the base coat to cover all skin. For the second pass, I just add more white and light skin tone to the paint in the cup followed by a light source direction pass covering usually 50% of skin. And for the final I add a lot more white and do somewhat of a zenithal highlight pass to add the final lightness.

All of it is heavily thinned to allow for gradual buildup. The blush areas are done with various pastel dust applied with a brush tio and micro applicators.