Note the very subtle shadow that falls on the eyeball itself, just below
the upper eyelid. Be careful not to be heavy-handed with this, or you’ll
ruin the effect.
NOSE
The nose is made up of two distinct sections: the bony part just below
the bridge of the nose and the ball of cartilage at the end of the nose.
Neither should be heavily defined in your drawings, but they should
contribute to the subtle contours of the outline.