Self Portrait Process and Color Tips (Patreon)

Here are some process shots of a self-portrait, and I figured this is a good example of  using hue shifts on the face. Here's an exaggerated diagram showing how the colors change over the face area:

Here are some color samples from the painting, showing how you could apply this more practically:

There are often greens in the beard area as well as blues, and very often you can just use a desaturated skin color to act as blue, instead of a literal blue. 

By the way, subsurface scattering colors are most often fully saturated orange/reds, so don't be afraid to go wild there.

Hope this was useful!