Chris Saper has addressed many of the issues source photos have in common in her book "Painting Beautiful Skin Tones with Color & Light". To see what is really happening in these "value clumped" areas of shadow, she suggests back-lighting the photo, by taping it to a window or table lamp.
What medium do you intend to use? I like the photo you've chosen, you have achieved the coveted "single light source" and I think once you get in there and start working you'll find the values you need.
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