Step 11: Tighten Sonic the Hedgehog's mouth by curving it more and drawing a laugh line on top. Inside his mouth, draw a curve near the top for his teeth and one below for his tongue.

Step 12: Darken the wavy line that makes Sonic the Hedgehog's eyes, but draw an extra line in the middle to represent his furrowed brow. Above each of Sonic's eyes, draw a large curve to represent the rest of his brow. Draw the curve on the left so it comes out of the main circle a bit.

Step 13: Finish drawing Sonic the Hedgehog's eyes by closing the part of the main circle below his left brow. On the right sides of his eyes, draw three long ovals inside each other and shade the middle one in. These will be his irises, pupils and glare. A large portion of the eye on the left will be hidden by Sonic's brow.

Step 14: Tighten the shape of Sonic the Hedgehog's ears. Draw them more round so that they won't be so pointy. Draw a trianglelike shape within the right ear to represent the inside part of Sonic's ear.

Step 15: Using the triangle spikes on Sonic's head as guides, tighten the spikes on his head. Draw them so they curve down and slightly overlap each other.