After the eyes the mouth is the second most expressive element of the face. The pinkish colour of the lips is due to the tissue they are made of, transitional between the mucous membrane (found inside the mouth) and the skin. When drawing the lips make sure that, above all, you carefully draw the line which separates them - ensure that it lies on the semi-cylindrical surface of the jaw bones and follows the rules of perspective I have already mentioned. The simple sketches shown below indicate some of the basic characteristics of labial morphology. Notice, for instance, that the upper lip is usually thinner and more protruding than the lower.
On this page I have drawn mouths in a range of smiling postures which typically feature in portraits. Note that the teeth are barely drawn, with little attention paid to minor details of little significance. The lips of elderly people (the two drawings at the bottom) are often thin, and furrowed by a number of vertical wrinkles.
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