Light and Shade - How to Resources
Step by step light and shade using hatching technique:
http://willkempartschool.com/how-to-shade-a-drawing-light-shadow-part-2/
This is the guy with the great apple drawings.
Books, Websites, Study Guides, and PDFs
"Drawn from Life" by Walter W. Wright
Free pdf on this site, as well as many drawings by the author.
"The Elements of Dynamic Symmetry" by Jay Hambridge (Book)
Gesture Line pdf
Contour Drawing pdf
Line Drawing Techniques
Line Drawing
types explained!
Drawing with the Right Side of
the Brain (website for the book)
How to Copy an Old Master Drawing
Tips on Drawing from Old Master
Drawings