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Paul, I'm gratified to be of some small help. Here's another suggestion:
Make a couple of value scales in neutral grey, swatches about an inch by three inches wide, "pure white" at the top, "dead black" at the bottom, and eight stops between.
When you approach your subject, assess a "local" value for light and shadow. For example, if you number the scale with black being "1", a white cloth on a table may be value 9, in shadow # 6, say,depending on the lighting. The shift of three values will hold true across the board.
That means if an apple on the cloth may have a "local" value of 5 in light, its shadow will shift on the scale three places to 2, same as the cloth.
It's my contention that color simply falls into place if grey-scale values are correct.
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