Thank you, Karin.
I am beginning to see what is meant by a "lost" edge. It it much easier for me to understand something if I can see it. I guess that goes along with being a painter, as I relate on a visual level rather than conceptually. I will look for lost edges in the masters' paintings.
That would be another lost edge on the left side of the model's face. The eye of the beholder fills in what is known to be there. I will incorporate this into my paintings (or try to) in the hopes that they begin to take on a softer appearance and will not look like "cut outs".