With the outline complete, we can start to shade the face. Firstly, I have included a diagram showing the steps involved in shading smoothly. You start by roughly shading a patch of the drawing. Then, smooth this out with cotton pads - use small circular motions to get a more even finish. Then repeat these two steps until you get nice, even tones. As for the actual drawing, there are three steps displayed in this image: [Step 1] Add a layer of rough shading across the main facial features. Leave the front of the muzzle, chin and patches around the eyes blank as these areas should have very light tones. Note that there are patches around the side of the muzzle that are slightly darker than the rest to give some variation in the tones of the lion's face. [Step 2] Smooth out the rough shading using the previously mentioned technique. [Step 3]Lions have black skin surrounding their eyes as shown, but also note the white patches below these rings. Also begin to shade the mouth and the nose. The nostrils will end up being slightly darker than the rest of the nose, so keep that in mind in later steps.