Step 3. The artist begins to darken the upper lip. which is normally in shadow, as you've seen in the preceding demonstrations. He darkens the dividing line between the lips, accentuating the shadows at the corners of the mouth. Just above this dark line, he darkens the shadowy upper lip to emphasize its roundness. He places a light tone on the tower lip. which turns upward and receives the light, but he darkens the shadow plane at the right. Rough strokes darken the pool of shadow beneath the lower lip. He begins to add tone to the side of the chin and jaw. And he adds a heavy shadow to the groove above the upper lip.
Step 4. The artist continues to darken the shadowy upper lip and strengthens the dividing line between the lips. He adds more tone to the corners of the mouth. Although the tower lip receives more light than the upper one, the lips are darker than the surrounding skin—so he adds more tone to the lower lip, leaving just a patch of light for a highlight. He darkens the shadow plane of the lower lip at the right and strengthens the shadowy underside of the lip to make the shape look rounder. Finally, he adds more tone to the chin and jaw, as well as to the groove above the upper lip. Compare the soft, round female mouth in this demonstration with the more angular male mouth in the preceding demonstration.
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