Drawing Values vs. Shading - Drawing Evolution

Values and Shading are drawing terms that are commonly used interchangeably, however they have different meanings and ways to go about learning to use them.

When making a drawing, is it better to color in the drawing and then add shading, or add the shading first and then color the whole thing? - Quora

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Shading techniques

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Shading techniques

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How to Draw Rocks • John Muir Laws