Step 10: Inside the head, on the upper, right side, draw a small circle for the eye. Sketch lightly at first and only darken the shape when you get the size and placement right. Shade the inside. As you shade the inside of the parasaurolophus' eye, make the middle part darker for the pupil and leave a tiny portion blank to represent glare. Add a few lines around the eye for extra detail on the cranium. Add a few longer lines at the top for the base of the crest on the dinosaur's head. Add a few longer lines at the top for the base of the crest on the head.
Step 11: Use the small arc to the right of the head as a guide to draw the dinosaur's mouth and the top jaw. Starting at the tip of the arc, draw a wavy line that extends toward the inside of the head for the mouth. Now darken the top part of the arc and a portion of the initial circle to create the top jaw. Add a few lines above the mouth for extra detail and for the nostril that's on this side.
Step 12: Follow the basic path of the bottom section of the arc to create the shape of the parasaurolophus' lower jaw. The jaw should extend to the left and curve up a bit along the path of the initial circle.
Step 13: Use the curved line on the head as a guide to draw the parasaurolophus' crest. Follow the basic path of the guide as you draw the crest around it and make the overall shape wider. The top part of the crest should meet the forehead at the top. Add a series of lines right on top of the guide to give the crest a rougher, bony texture. Continue drawing the lines above the dinosaur's eyes all the way down to the nostril.
Step 14: Use the second line from the right under the dinosaur's body as a guide to draw the front leg that's on this side. Follow the path of the guide and lightly sketch the shape of the leg around it. When you get the shape of the leg right, darken the lines. Curve the shape of the leg where the guide line bends to indicate the joints. Use a couple of lines at the tip of the foot to separate the individual toes.