Step 16: Use the original circle as a guide to draw the rest of the head. Follow the basic path of the circle but make the sides bulge out a bit to create Bonnie's cheekbones.
Step 17: Draw the lower jaw by using the wide U-shaped line under the head as a guide. Darken the initial line and add a second similar, but smaller, line within the shape for the edge of Bonnie's jaw.
Step 18: Add another wide, curved line under the muzzle for Bonnie's open mouth.
Step 19: Inside Bonnie's mouth, near the bottom, draw a row of small oval-like shapes with semi-pointy tops for the teeth.
Step 20: Under Bonnie's lower jaw, draw the bow tie using a series of short, curved lines. The open lower jaw is blocking the top part of the bow tie, so don't draw the whole thing.