Step 10: Darken the second shape from the right that's under the body for the plesiosaurus' first limb. Make the lines at the top longer so that they're inside the body. Make the base of the limb thin like an oar. Add some lines around the base for creases on the skin. Darken the shape on the right for the plesiosaurus' other limb.

Step 11: Use the shapes on the left as guides to draw the plesiosaurus' hind limbs the same way. Make the top part of the limb thinner and stretch it inside the body. Add curved lines around the base for wrinkles. Darken the shape on the right for the hind limb that's on the other side of the plesiosaurus' body.

Step 12: Use the remaining lines and shapes as guides to draw the rest of the plesiosaurus' body. Simply darken the outer edges of the initial guides to create the shape of the body. The top of the body is made up of one long, continuous wavy line from the back of the head to the tip of the tail. On the top and bottom tip of the tail, draw a couple of angled lines for extra fins. Darken the lower edges of the guides but don't overlap the limbs that are on this side of the body.

Step 13: 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 value throughout the plesiosaurus' body for shadows. This will give the figure 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. For a more detailed guide on how to shade, check out this tutorial: How to shade.

Add a lighter value all over the plesiosaurus' body for extra detail. Nobody knows for sure exactly what plesiosauruses looked like, so you can shade yours however you want. If you'd like, you can add spots on the body using random splotches of dark value. Make the spots dark at the top and light at the bottom for a transition effect. Leave the underside blank. Add smaller spots between the big spots and on the limbs. Use random scribbles to give the skin texture. Use current sea animals as inspiration on how you shade your plesiosaurus. Shading can be time-consuming, so be patient and take breaks. Don't forget to pause the video to draw at your own pace.

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