Draw a horizontal guideline for the mouth
Sketch a simple oval or almond shape for the lip outline
Mark the center line where the lips meet
Shape the upper lip with two soft peaks
Shape the lower lip with one larger rounded curve
Refine the corners of the mouth
Add the cupid’s bow on the upper lip
Adjust the proportions of the upper and lower lips
Erase unnecessary construction lines
Add shading to show volume
Darken the line where the lips meet
Blend highlights and shadows for a natural look