Step 15: Use the wide arc at the top as a guide to draw the dinosaur's spine. Follow the path of the guide and add a line with a series of points for a jagged spine. Lightly sketch a few lines within the shape of the sail to give the spinosaurus' spine more structure.

Step 16: Use the remaining lines as a guide to draw the rest of the dinosaur's body and tail. Darken the lines and make them wavier for a bumpier texture. Darken the shape of the spinosaurus' tail too. You can also make the tail wavier to indicate motion.

Step 17 (optional): 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. Also re-draw any final sketch lines that you may have accidentally erased.

Final Step (optional): Add some shading to your spinosaurus 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. Also add a cast shadow underneath. This helps ground the dinosaur so it doesn't appear to be floating.

You can add more value throughout your spinosaurus drawing for extra detail. You can add an even value throughout the dinosaur's body for a solid pattern. You can also add different values all over. Nobody is exactly sure what they looked like. Some dinosaurs may have even had feathers! So you can add stripes or spots or anything you'd like. You can also add extra dots and random squiggly lines all over for a rougher and grittier texture like crocodile skin. You can pause the video to use this drawing as reference and at any other time you need help.

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