Step 10: Lightly sketch the eyes inside the head as two small circles. Use the initial lines as guides for placement. When you get the size and position right, darken the lines. Make the sides of the eyes pointy. Add a couple of curved lines around the warthog's eyes for the skin. Add a couple of lines at the top of each eye for eyelashes. Shade in the eyes using a dark value. Inside each eye, leave a tiny circle blank to represent glare.
Step 11: At the bottom of the initial arc, lightly sketch a small oval for the warthog's snout. When you get the shape right, darken the lines but make the top and bottom narrower. Inside the snout, draw two small circles for the nostrils. At the top, draw a few short lines for the wrinkles above the snout.
Step 12: On either side of the nose, draw a curved line for the rest of the snout. The lines should curve away from the nose, and then back in higher on the face. Add a series of short lines throughout the warthog's snout for the hair and wrinkles.
Step 13: On the right side of the muzzle, draw a small triangle-like shape for the first lower tusk. Draw another small, triangular shape on the left side for the other lower tusk. Now draw the longer upper tusks above using a couple of curved lines that come to a point. You can make the warthog's tusks bigger or smaller if you'd like.
Step 14: Darken the pointy arcs on top of the warthog's head to create the shapes of the ears. Add a curved line inside each ear for the inner structure.