In direct contrast to black and white skin toning, where the goal is to create a smooth and even under tone, learn an extremely nuanced approach to dodge and burn skin. Understand how to create shape, contour and dimension, by accentuating the highlights and shadows of the image. Focus on a key facial features with a multi-pass approach. Use Photoshop's tools to paint masks, blend and layer subtle nuanced detail that enhances the methodical and intentional lighting setup of production.