Shading in a drawing is used to create Value.
Value is the darkness or lightness of a color. Light values are called tints and dark values are called shades.
Contrast deals with difference. Contrast is produced when any difference between elements such as texture, color, size, or value occurs. It can be subtle or extreme. When it comes to shading, we are mostly concerned with the contrast that is produced from changes in value.
When light hits the subject, it produces a range of contrasting values. The intensity of the light determines the contrast of values. Generally, the stronger the light - the higher the contrast
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