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Draw your base.
Color in the lips with the base color.
Use the color you first started with, and just shade in the lips to make them more full and to add some light/shadows.
Add the base shine.
Color in the teeth and shade a bit around it so they don't stick out too much.
First, use the lighter color to add to the base shine, then use the white to add more over that.
Clean up/blend down anything you want to fix.
I just added a little bit more darker lines in the middle of the lips.
Finish off with overlay shine.
SAI, Wacam Bamboo Pen Tablet
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