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I work on toned canvas-usually raw umber thinned with turpentine which provides a solid neutral tone and I start each portrait by doing a drawing with ivory black.
As with my Watercolors, I start adding Color in the face, which I block with four values. I start by mixing my shadow color, then take a portion of this mixture and lighten it with white to create my halftone. Next I lighten a portion of the halftone mixture to produce my lights. Finally, I adjust a portion of in light mixture to produce my highlights. My brushes are all bristle filberts and I usually start the head using a different No. 6 for each tone. This keep the color clean and allows me to work the tones together.