Here I'm beginning to add skin tone colors. I normally start with the forehead and eye area- this normally sets the what the skin tone will be like for the rest of the face and body-how warm or cool, what hues I use for shadows and highlights, etc.
And here are the colors that I'm using and mixing on my palette to create the skin tone.
The hues for the mid range for the value of the skin is a mixture of cadmium red and cadmium yellow light. From this, add either zinc white or flake white to lighten the pigment to the mid range.
I use alizaren crimson for the next value/intensity level below the mid range. So this would be the lighter shadows. To make a slightly darker shadow than this, I add cerulean blue.
Next I have finished more of the face with these colors.