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How to Draw Clouds - Building Darks and Lifting Lights
H South, licensed to About.com, Inc.
Shading with a sharp B pencil builds up value in the darker areas of the drawing. Shade carefully up to the edges of very crisp areas of highlight. Shadows in the clouds are shaded, then a kneadable eraser used to soften edges. Once the values are well established, use sweeps of a clean kneadable eraser to lift out cirrus cloud.
Perspective, Atmosphere and Sky