In representing rounded form we use tonal progressions. A tonal progression is a succession of color mixtures proceeding from dark to light. In addition to value change, tonal progressions also vary in hue and chromatic intensity as well. The tonal progressions we use depend on the tonalities of the person or object we’re painting as we perceive them according to the key of the light. The tonal scale shown below is an example of a typical progression, not a simple recipe for “how to paint flesh tones”. It shows a series of mixtures that modulate into one another gradually. The component tube colors are shown alongside. 

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