1. Outline the lip shape.
First, you’ll notice that the center line between your upper lip and bottom lip extends past the corner of the mouth. “This curved line is where you get a lot of your expression. “Never draw it as a straight line,” advises Bevis.
“The head is a cylindrical shape,” Dockery points out. “Start with two dots to mark the corners of the mouth,” he says. “Then find the line between those two points; one is usually higher or lower than the other.” Pay attention to the curvature of the face and wrap your line around the curve. Now you have an anatomically accurate starting point.
Draw lightly, so you can go back over your final lines later with a firmer touch and use an eraser on any unnecessary sketch lines. If you’re working digitally, you can simply trace over your underdrawings on a new layer.