Artistic tone
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Tone in an artistic context refers to the light and dark values used to render a realistic object, or to create an abstract composition. When using pastel, an artist may often use a colored paper support, using areas of pigment to define lights and darks, while leaving the bare support to show through as the mid-tone.
When making a portrait eg. heavy dark tones to represent a moody or dark side to a personality. Tone can also be used to make the face look 3-dimensional, for example darker tones around the chin, nose and eyes; lighter tones on forehead, nose and cheeks.