I think what Steven is trying to say (correct me if I'm wrong) is that in the reference for both portraits there was probably a lot of light on the shadow side of the faces but that it's not always the best thing for the painting to render it the way it shows in the photo.
Perhaps some portrait photographers would have moved the light source so that there weren't those strong lights on the far side of the faces to begin with. I'm not saying it's necessarily wrong to light a face that way. It's just that I think it makes a head feel more round (less flattened) if the light is not set up to create small strongly lighted areas on the shadow side. Part of the value massing thing.
Personal preference, perhaps.
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