I hope you can find here some cool shading resources
If you know more, let us know^^
Drawing-tutorial (https://www.deviantart.com/drawing-tutorial)
Find your way around DA #5: Coloring and Shading:
Shading and Lighting
Face shading trials
Face shading, basic planes
Face Shading
Body Lighting, female body lighting
HOW TO SHADING THE LEGS, HOW TO SHADING THE THIGH HIGH STOCKINGS
Exercise 29: Practice Sheet, Exercise 29: Back to Basics Step by Step
Quick n' Dirty: Light on Faces
Light Source Tutorial
[Quick Trick] Back Light
[Quick Trick] Tree Shades
simple lighting tutorial
Coloured Shading Tutorial - How to pick a palette
How to...draw light
How To Draw Face - Shadow
Tut