Look before you leap
Mike,
I love the photo but I fear it is not a good reference photo candidate. The shadow is not very informative and the hair in the shadow does not separate enough from the overall shadow of the skin.
I took your photo and broke it down into 11 values: black and white (both of which are not present in your photo) and 9 value steps in-between. Notice the value patterns. The
lightest light is on the forehead. See how much darker the lightest part of the neck is. All values must remain in their proper relationship for 3D form to happen.
It is essential to see how the values on each form darken as they radiate away from the
lightest light. This is the key, concentric stripes of diminishing values. Check out any old master painting and this is the common thread.
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