How to Master Basic Shading Techniques : bring your drawing to life (English Edition)

Shading is the process of applying varying levels of darkness to create the illusion of form and depth.
Aside from practicing proper shading and blending techniques, a good understanding of light, planes and contours are crucial for turning a flat line drawing into a realistic portrait that conveys the illusion of form, bringing your drawing to life.
You don't need a talent; you just need patience and perseverance. Start with these book