Step 11: Above the other construction line, draw his mouth. Goku will be showing his teeth in a grimace to go along with his determined gaze. Draw the shape of the mouth, then two lines on the sides to indicate his teeth. A line on the bottom makes up Goku's lip.
Step 12: Darken the lines that make up Goku's jaw and neck, and give them a more rounded shape. Draw some lines in his neck to indicate structure.
Step 13: Draw Goku's ears and make them less round. Add a few lines within them to give them structure as well.
Step 14: Goku’s hair is a bit tricky, so it’s divided into three parts. First draw the part that comes over his forehead or his bangs. Think of them as two big, curved letter V’s and smaller V’s next to them that touch his ears.
Step 15: Now draw the left side of Goku's hair, which is essentially made up of three huge spikes and a smaller one on the bottom near his ear. Use the image above if you need more reference when drawing.