Bonus Edition: Drawing Techniques & Shading

(Albrecht Dürer, Veronica, engraving 1513)

Examples regarding drawing with shading - especially: bar shading, cross hatching and stipple techniques:

Bar Shading
About.com: Design Patents - Shading - http://inventors.about.com/od/designpatents/ss/shading.htm Challenge: Draw a Bar of Soap - http://www.flickr.com/photos/mweltephoto/355919414/

Cross Hatching
HowTo.com: How to Draw Cross Hatching and Hatching - http://www.ehow.com/how_2097625_draw-crosshatching-hatching.html
Shading and Rendering: http://www.portrait-artist.org/basics/shading.html
Wikipedia: Hatching - http://en.wikipedia.org/wiki/Hatching

Stipple
Wikipedia - http://en.wikipedia.org/wiki/Stippling
Stippling or Pointillism Demo - http://www.tothepointdesign.com/stippling_demo.htm
Randy Glass Studio - Wall Street Journal portraits - http://www.randyglassstudio.com/layout_portrait-wsj.html
Nolin Novak Illustrations - http://www.nolinovak.com/

General Resources for Drawing Techniques
V. Ryan: Graphic Design - http://www.technologystudent.com/designpro/drawdex.htm
About.com: Drawing and Sketching - http://drawsketch.about.com/cs/pencilgraphite/a/pencildrawing.htm
eHow.com: How to Shade with Colored Pencils - http://www.ehow.com/how_2102543_shade-colored-pencils.html
Cornell University: Sketching techniques - http://www.entomology.cornell.edu/Faculty_Staff/Danforth/322LabManual/append_2.pdf
Life Sketch - Drawing with Shade - http://lifesketch-anna.blogspot.com/2007/11/drawing.html
Wikipedia: Drawing - http://en.wikipedia.org/wiki/Drawing