Step 20: Use the remaining lines and shapes as guides to draw the rest of the westie's body. Draw a series of strokes along the outer edges of the guides to create the furry shape of the body. Use longer strokes along the underside of the body for the longer fur found there. Use longer strokes along the left side of the terrier's furry chest. Under the head, draw a shape similar to the letter V that's made up of short strokes to emphasize the neck. Draw a series of strokes around the line on the top, left side to create the shape of the west highland white terrier's tail.
Step 21: 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 west highland white terrier drawing to give it more dimension and volume. Use a medium value for the shadows and a darker value for the nose. Leave a strip along the top of the nose blank for shine. As you add the value, use strokes that go in the general direction of the fur. For a more detailed guide on how to shade, check out this tutorial: How to shade.
Separate each individual stroke a bit so that the white of the paper comes through and emphasizes the fur-like texture. 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.
Use longer strokes at the bottom for the longer fur found there. Westies are white, so don't overdo the shading. Shading can be time-consuming, so be patient and take breaks. It's always a good idea to use reference as you draw. Remember to pause the video to draw at your own pace.
Add a cast shadow underneath. This helps ground the west highland white terrier dog so it doesn't appear to be floating.