Fill in the dark areas within the corners of the mouth with Dark Umber. Lightly edge around the teeth to create their shapes. Do not use a hard outline. With teeth, a dark line represents space between, and usually teeth touch each other.
Continue applying Dark Umber with a sharp point to the shadow edge of the upper lip, to the cast shadow below the lower lip, and just above the edge of the lower lip. Leave the areas of reflected light alone. Add more Dark Umber to the corner of the mouth on the right side, and to the indentation above the upper lip.
With Chocolate and a sharp point, apply tones to the left side of the mouth. Add a small amount to the right side of the lower lip as well, leaving an area of reflected light.
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