Step 20: 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 mandrill drawing for extra detail. Use a dark value around the eyes, a medium value for the nose and a light value for the face ridges. To get different degrees of tonal value, vary the pressure on your pencil. As you shade the head, use dark strokes that radiate backward from the face. Use a very light value for the goatee- like hair around the mouth and for a small patch behind the ear. Use dark strokes for the arm on the other side of the body except for a lighter section on the inside.
Use a medium to dark value for the rest of the mandrill's body. As you shade the rest of the body, use strokes that go in the general direction of the hair. Use a very light value for the fur along the bottom of the torso on the chest and belly. Separate each individual stroke a bit so that the white of the paper comes through and emphasizes the hair-like texture. Leave a section on the monkey's rump blank for the light-colored fur found there. Use a light value for the hands and feet. Shading can be time-consuming, so be patient and take breaks. It's also a good idea to use reference as you draw.
Add a cast shadow underneath. This helps ground the mandrill so it doesn't appear to be floating. Don't forget to pause the video after each step to draw at your own pace.