Notice the heavy shading between the eyebrows and upper eyelid. The
reason for its inclusion is that the eyebrows protrude over the eyes,
and therefore, any light from above (sunlight, moonlight, lighting
fixtures, diffuse light) casts a shadow on that pocket just above the eye.
MOUTH
Beginning artists often think of male lips as two lines with no contours.
The truth is that male lips have contours as well as thickness, but
we’ve got to treat them subtly so that they don’t appear too feminine.
Let’s take a look at how it’s done.