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Hello Richard
Sargent worked with two values in the beginning that three. The two values represented the separation of light and shadow. The light value was represented with the darkest part of the light. The shadow was represented with the lightest part of the shadow.
By starting this way he was able to map of the whole head. Within this was the direction, size, placement, likeness, temperature of the light source, and the beginnings of facial expression. Within the light area, since she is already painted the darkest part of the light, the only worked lighter. In the shadow area, since see as already painted the lightest part of the shadow, the only worked darker. This is quite readily apparent when viewing original paintings.
I hope this helps and good luck in your studies, Clayton
Here is an example of a painting demonstration I did using Sargent's method. If you notice the thickest parts of the painting are the darkest darks and the lightest lights. If you 'dig' the down to the thinnest layers you will find that this is the beginning of the painting and it is the separation of light and shadow.
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