Mary, here is an off the wall idea, if the photo you have lacks the kind of shading and modeling that you require here is a suggestion. Find another man, anyone really, place them in the identical pose with a single source of light. Photo this person and study the resulting shadows and highlights, which could translate if the pose is similar, and do your best to interpret them onto your painting. I have a hard time guessing at where shadows might start and stop.
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Mike McCarty
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