Step 6: Use the initial football-like shapes as guides to draw the outline of Donatello's eyes. Follow the basic path of the shapes, but make the eyes a bit more narrow near the center.
Step 7: Inside each eye, draw a circle for the irises. Inside each iris, in the middle, draw another circle and shade it in for Donatello's pupils. Draw a tiny circle inside each eye, off to the side, to represent glare.
Step 8: Donatello's eye mask is a bit tricky, so it's divided into two parts. First draw the top part as a wavy line above the eyes. The line should dip in the middle and curve up on either end.
Step 9: Now add the second part of the mask as a curved line below Donatello's eyes. The bottom part of this line should be almost parallel to the horizontal construction line. The sides should curve up and meet the top part of the mask. The sides should also be inside the main circle and not touch its sides.
Step 10: Add Donatello's mouth near the bottom of the main circle. The shape of the mouth consists of a curved line at the bottom with a slightly flatter line at the top. It looks something similar to a sideways letter D.