Step 10: Use the horizontal line as a guide to draw the top part of the mouth section. Follow the path of the guide and darken a curved line on either side of Sonic's nose. On both sides, curve the lines down to create the cheeks. Darken the bottom edge of the big circle to complete this section of the face. Inside this shape, on the right side, draw a small, curved line for the smirk.

Step 11: On top of the mouth section, on the right, draw a big, tall arc for the first part of Sonic the Hedgehog's eyes. Sketch the line lightly at first to get the shape right. Curve the line above the nose for a furrowed brow. When you get the shape right, darken the line. The eyes should take up a big part of the top of the head. On the left side, draw a similar shape but make it narrower. Follow the curvature of the initial circle to draw the left edge of the eye.

Step 12: Inside Sonic's eye on the right, near the middle, draw a long oval for the first iris. On the left side, close to the nose, draw another oval for the other iris. Inside each iris, draw a small oval and shade it in for the pupils. Inside each iris, off to the side, draw a tiny circle for highlight.

Step 13: Darken the triangular shapes on top of the head for Sonic the Hedgehog's ears. Make the ear on the right side a bit longer on the bottom. Inside each ear, draw small triangle for structure. These smaller triangles should be a bit round on the sides and corners.

Step 14: From the ear on the right, draw a long line that curves to the bottom for Sonic the Hedgehog's first spike. At about where the horizontal guide is, angle the line to the left toward the head to finish the triangular spike. Draw a curved line between the ears for the spike that curves back. We can't see the tip of this spike from this angle.