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 shape right, darken the lines. The musk ox's eyes should be small, and they should be close to the outer edges of the head. Draw a few lines around the eyes for extra detail on the wrinkles.
Step 11: Shade in the eyes using a medium value. Make the middle section of the eye a little darker for the pupil. Leave a tiny section at the top blank to represent glare. Add a few short strokes around the eyes for the fur. Musk ox eyes are small, so don't worry too much about the detail. Just shade them in.
Step 12: Add the musk ox's nose by first lightly sketching a curved line near the bottom of the head. Darken the line using short strokes for the fur. Add two thicker lines underneath for the nostrils. Add more short strokes below the nostrils for the bottom part of the nose.
Step 13: Draw a thick, horizontal line under the nose for the mouth. On either side of the musk ox's mouth, draw a line that's made up of short strokes that curves up for the muzzle. Darken the lower edge of the initial guide using quick, short strokes to create the chin.
Step 14: Use the initial shapes and lines as guides to draw the head. Darken the sides of the guide using quick, short strokes to create the shape of the furry head. Add a series of quick, short strokes above the eyes for the top part of the head. The top of the head should curve up from the eyes and meet in the middle. Add a few more quick, short strokes below the eyes for more detail on the musk ox's fur. Draw some strokes down the middle of the head to form a broken V-shaped line for more fur.