Shading
Read this shading tutorial
This work by Carmen Rio is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Read the shading tutorial published by Brian Duey at http://www.dueysdrawings.com/shading_tutorial.html, and then answer the questions that follow.
Licensed under the Creative Commons Attribution Non-commercial Share Alike 3.0 License