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To answer Lisa's original question about figuring out absolute value, a printed value scale (you know, a row of boxes with different greys, from black to white) is very helpful.
Search on the web under value scale and you'll find several that you can print out. Then hold it up to your reference. Squint and you can determine that the shadow side of an arm is a value 3, for example. Then hold the same strip of paper up to your work and check what you've painted against that same value square.
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