Step 20 (optional): For a cleaner look, erase as much as you can of the initial guide lines. The ankylosaurus's armor makes this hard to do, so don't worry about erasing all of the guides. It's okay to leave some behind. Re-draw any final sketch lines that you may have accidentally erased.
Final Step (optional): (optional): Add some shading to your ankylosaurus 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. Don't worry too much about the shading if you're going to add more value to your ankylosaurus drawing .
Add a cast shadow underneath. This helps ground the dinosaur so it doesn't appear to be floating.
You can add even more value throughout your ankylosaurus drawing for extra detail. Shade using squiggles and scribbles to get a rough and scaly texture. Don't overthink it. Just add a bunch of small scribbles all over the body except for the osteoderms. Add the value lightly at first, then gradually build up to the level of darkness that you want.
Continue adding the scribbly texture until the ankylosaurus's entire body is covered with it. Add a darker value under the osteoderms for their cast shadow and to make them stand out more. Nobody knows for sure exactly what ankylosaurus looked like, so you can shade yours any way you'd like! Add a series of lines inside each osteoderm to give them a rougher texture. Don't forget to pause the video after each step to draw at your own pace.