Step 15: Use the Gallimimus' first arm as a template to draw the bottom part of the other arm peeking from behind. Most of this limb is blocked by the first arm, so just draw a few of the pointy digits curving to the left.
Step 16: Below the head, draw a long, curved line that's parallel to the initial guide for the neck. Don't draw this line too far away from the initial guide, otherwise the neck will be too thick. Darken the initial guide line to complete the shape of the neck. Darken the outer edges of the first circle and arc to create the shape of the body. On the left side, leave a big gap open where the base of the Gallimimus' tail will be. When you darken the bottom edge of the torso, don't overlap the limbs that are on this side of the body.
Step 17: Darken the guide line on the left for the top edge of the tail. Below that, draw a long, sloping, horizontal line that connects to the body for the bottom edge of the Gallimimus' tail. Make the base of the tail on the right side wide and the tip on the left pointy.
Step 18: 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: Add some shading to your Gallimimus dinosaur drawing to give the figure more dimension and volume. Pick the direction of the light source when shading so that the shadows are consistent with it. Shade lightly at first, and then gradually build up to the level of darkness that you like. Vary the pressure on your pencil to get different degrees of tonal value. For a more detailed guide on how to shade, check out this tutorial: How to shade.
Add a cast shadow underneath. This helps to ground the dinosaur so it doesn't appear to be floating.
Use a bit of rough shading on the Gallimimus' entire body to give the skin more texture. As you shade, separate your strokes a bit so that the white of the paper comes through and creates a rough texture. Gallimimus most likely had feathers but because this is the Jurassic Park version, we're omitting them.
Shading can be time-consuming, so be patient and take breaks. Don't forget to pause the video to draw at your own pace. As you shade, make the shadows darker too so that they stand out more. Draw a series of triangular shapes across the top edge of the dinosaur's body using a dark value to create stripes.