Joan,
Value massing does not necessarily mean all the same values need to be touching, it means that within a value mass, i.e., the dog, all of the values in that dog are light values. No bouncing around with a dark shadow under his chin, or middle value swirlies on his fur. All of the modeling and definitions are carried out in the value mass you've designated for that area.
The floating bow, I see as an atmospheric problem. The bow is usually further back on the head, and will not have the same high definition and bright color as something closer to the viewer, like the subject's nose. I could still be a light value, but the edges would be softer and more atmospheric.
Peggy
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