Step 6: Below all of this, draw a long, sloping, wavy line for the top part of the open mouth. Remember to sketch lightly at first and only darken the line when you get the shape right. The line should stretch to the right all the way past the T. rex's eye.

Step 7: Draw a series of V-shaped lines under the mouth for teeth. The Tyrannosaurus rex's teeth don't all have to be the same size. Try making them different sizes. Stop adding teeth before you get to the end of the line.

Step 8: Starting on the right side of the mouth, draw a line that slopes to the lower, left side for the bottom jaw. Make the line wavy. At the bottom, draw a short line for the front part of the T. rex's lower jaw. Draw a line that curves back up for the bottom edge of the lower jaw.

Step 9: On the right side of the open mouth, draw a curved, vertical line for the skin that connects the T. rex's jaws. Draw a series of triangular shapes along the lower edge of the open mouth for the rest of the dinosaur's teeth.

Step 10: At the top, below the teeth, draw a curved line for the other side of the Tyrannosaurus rex's mouth. Don't overlap the teeth as you draw this line. Draw a series of V-shaped lines along the bottom path of this line for more teeth.