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Your Artist's Brain by Carl Purcell

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ALTERNATION DRAWING

I refer to drawings that exhibit constantly shifting relationship of values as alternation drawings: the value relationship between the figures and the ground constantly changes. It's necessary to simplify the variations in value to a manageable range. The value scale includes nine increments between black and white. Simplify these into three broad ranges: the lights, the middle grays and the darks.

illustration

Reference Photo

You can't pose this kind of subject, and you take what you can get for the value relationships. I did manage to do a quick sketch after I took the photo, but the photo was necessary for a finished drawing. ...

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