Step 10: Use the initial arc as a guide to draw the triceratops' muzzle. The end of the muzzle should come to a point to form the beak-like mouth. Draw a few small lines above the triceratops' beak for extra detail. Draw a couple of curved lines above the beak for the nostrils.

Step 11: Use the initial line as a guide to draw the top horns. The base of the horn should start above the eye. Curve the horn a bit for a more organic feel. Have the triceratops' horn come to a point and make it thin. The top horns were about 3 feet long! Draw the horn on the other side, too. Use the first horn as a template to make them similar.

Step 12: Use the small line as a guide to draw the horn above the nose. Draw a few lines within the horn for extra detail.

Step 13: Use the arc above the triceratops' head as a guide to draw the frill. Extend the arc for the frill to the lower left side of the head. Draw the line lightly. Follow the line and add tiny triangle-like shapes all around to form the bony part of the frill called the epoccipitals. For a simpler version, you can omit the epoccipitals and make the rear of the skull flat.

Step 14: Use the initial circle and arc as guides to draw the rest of the head. Draw another horn-like protrusion on the lower left side of the triceratops' head and add a few lines within it for extra detail.