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To add creases the lips, which will make them look more realistic, draw a series of curved vertical lines across the length of each lip. Vary the lengths of the lines, and have some start at the top of each lip and some start at the bottom. Make the lines on the left half of the lips curve out to the left, and make the lines on the right half of the lips curve out to the right. Make about 10 creases on each lip.
Add creases to the lips.