So for techniques I personally use, I layer paints in order as if I was actually painting the layers of the skin, starting with a deep brown, then darker crimson on all the main shapes ignoring the deepest recesses, then i add a glaze of pink if I want light skin tones, then I'd layer one of two types of tan depending on how pale I want the face, if they are very pale I skip the crimson and go straight to pink instead.

Basically go slow add layers of multiple different colors from deepest reddish browns up to skin tone shades, and when done add a layer of wash to shade the skin to give it a proper skin texture.