Step 15: Use the line on the far right side as a guide to draw the front leg on the other side. Follow the basic path of the guide line as you draw the shape of the leg around it. Use curved lines to indicate the joints and emphasize the muscle structure. Add the parasaurolophus' toes at the tip of the foot.
Step 16: Use the long line in the middle as a guide to draw the dinosaur's first hind leg. Follow the basic path of the guide line as you draw the shape of the leg around it. Sketch the shape of the leg lightly at first. When you get all the bends and curves right, darken the lines.
The overall shape of the leg should be wide at the top and gradually get narrower toward the bottom. Add a few extra short lines where the leg bends to emphasize the creases of the skin. Draw a short, curved line at the tip of the foot to separate the dinosaur's individual toes.
Step 17: Use the leftmost line as a guide to draw the parasaurolophus' other hind leg. Use a series of curved lines as you draw to represent the muscle structure along the leg. The wide portion at the top of the leg will be hidden behind the dinosaur's body, so don't worry about drawing it.
Step 18: Use the remaining lines as guides to draw the rest of the dinosaur's body. Simply darken the outer edges of the initial guide line to create the shape of the body. Add a few extra curves to the bottom part of the tail to make it less rigid and more organic.
Step 19: For a cleaner look, erase as much as you can of the initial guide lines. Don't worry about erasing all of the guides. It's okay to leave some behind. Re-draw any final sketch lines you may have accidentally erased.
Final Step (Optional): Add some shading to your parasaurolophus drawing to give it more dimension and volume. Pick the direction of the light source when shading so that the shadows are consistent with it. Vary the pressure on your pencil to get different degrees of tonal value.
Add a cast shadow underneath your parasaurolophus. This helps ground the dinosaur so it doesn't appear to be floating.
You can add even more value throughout your dinosaur drawing for extra detail. No one is exactly sure what parasaurolophus looked like, so you can shade your drawing however you'd like. You can even color it! For a simpler drawing, first use a medium value all over the body. Then add stripes or other patterns on top with a darker value.
Don't worry about shading too smoothly. The rough value will give the parasaurolophus' skin a tough, bumpy texture. Continue to add the value until the entire body is shaded in the pattern you want. Don't forget to pause the video after each step to draw at your own pace.