Introduction to Pencil Shading
By Helen South, About.com Guide
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Irregular Shading
H South
To prevent unwanted banding through a shaded area, change the pencil direction at irregular intervals, making one stroke long, then next short, overlapping where needed. The example at left shows an exaggerated example of how this effect is begun; at right the finished result.
Draw 101 - The Basics - Beginner Drawing Lessons