Step 10: Inside the head, near the top, right, draw a tiny circle for the eye. Inside the eye, add a dot for the pupil. If you have room, you can also draw an even tinier circle for highlight. Draw a couple of short, curved lines around the eye for the eyelids and wrinkles.
Step 11: Inside the muzzle, draw a small, slit-like shape and shade it in for the Paraceratherium's nostril. Draw a short, curved line over the nostril for the skin cover.
Step 12: Use the initial arc as a guide to draw the muzzle. Follow the basic path of the arc as you darken the shape of the muzzle but curve the line to the left for the mouth. The shape of the mouth should curve up and then back to the left and end at the edge of the initial circle. Draw a short, curved line under the Paraceratherium's mouth for the lower lip.
Step 13: Darken the small arc on the top, left side of the head for the first ear. Make the shape pointier at the top. Stretch the base of the ear in toward the head. Add a few lines inside the shape for the ear's structure. Use the arc on the right as a guide to draw the Paraceratherium's other ear in a similar way.
Step 14: Use the initial circle and arc as guides to draw the rest of the Paraceratherium's head. Darken the outer edges of the guides but make the shape of the head a bit thinner in the middle. The top part of the head should be a bit flat. The bottom should be curved for the big jaw. Draw a series of short lines inside the shape to give the head more structure.