Step 11: Inside the shape of the mouth, draw a few curved lines for Raphael's teeth. Don't draw every individual tooth. The lines are enough to indicate the top and bottom rows of teeth.

Step 12: Use the main circle as a guide to draw the top part of Raphael's head. Follow the basic path of the circle but make the sides of the head narrower. Unlike his Teenage Mutant Ninja Turtle brothers who have very round, smooth heads, Raphael has a very rough and angular head shape, so add a few sharpish edges on the dome.

Step 13: Draw the rest of Raphael's face using the bottom part of the circle as a guide. Just like the top part of the head, make the bottom part a bit more angular on the sides to create the cheeks. Add a few lines within the head, under the mask for extra detail.

Step 14: Use the wavy line on the right as a guide to draw the first end of Raphael's mask. Follow the basic path of the line as you make the shape thicker. The lines for the shape should be jagged to show the wear on the mask.

Step 15: Draw the other end of the mask using the final wavy line as a guide. This shape should be under the other end of the mask, so be careful not to overlap the lines. Don't forget to make the lines rough and jagged to show the wear on the cloth.