Realism Shading Tutorial 2.1

Part 2.2 [link]
Tutorial (c) Obi-quiet
Reference (c) [link]

Part 1: [link]
Link to drawing eye tutorial: [link]
Link to shading eye tutorial: [link]
Link to drawing noses: [link]
Link to shading noses: [link]
Link to drawing lips: [link]
Link to shading lips: [link]