That's it for the guides! From this point on, press harder with your pencil for a more defined drawing.
Step 11: Draw two small circles inside the head for the deer's eyes. Use the construction lines as guides for the position and size of the eyes. Add a few longer, curved lines around the circles for eyelashes and the corners of the eyes. The eye on the right should be a bit narrower than the one on the left because of the angle of the head.
Step 12: Shade the eyes except for a tiny circle to represent highlight. Use a lighter value near the bottom of the eye to give it a rounder look. Draw a series of short strokes above each eye for the fur on the brow. Draw a couple of lines under the deer's eyes for extra detail.
Step 13: Lightly sketch a small, square-like shape inside the deer's muzzle for the nose. Pay attention to the size and position of this shape inside the original circle. When you get the size and shape right, darken the lines. Curve the sides inward to create the deer's nostrils. Darken the top edge but make it more curved than the initial shape. Make the bottom part narrower than the original sketched shape.
Step 14: Draw a horizontal line under the nose for the deer's mouth. Curve the line up toward the nose on the right side. At the bottom, follow the curvature of the initial circle for the chin. Draw a couple of lines on the top, right side of the nose and on the left to complete the muzzle.