Master the gradient mesh tool

08. You should now have a basic bottom jaw without the skin texture. To add texture, play around with the mesh lines we already have, and add a few new ones for control. Add vertical mesh lines and bend them to match the bone structure, adding a highlight colour to the light side. This gives the impression of skin stretched over bone.

09. Add in mesh lines until it resembles a grid, then fill the grid with alternating light and dark colour to add fine texturing, like skin patterns.

10. The upper jaw, eyes and nostrils are all created from one mesh; this is the most complicated part of the illustration. Draw its silhouette and fill it with a mid-tone colour (C = 52, Y = 28, M = 67, K = 22). First isolate the eyes and the area where the nostrils will be. For the eyes, mould the mesh into the shape of the eye, and add a mesh to separate the whites from the pink parts of the eye. Fill the pupil with white and the corners with pink. Create the pupil and add brown. Add a mesh to indicate light and dark areas in the pupil.

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