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Mary,
One detail I've noticed in many fine portraits is the pleasant way the corners of the mouth seem to disappear into a puddle of shadow. Look through Bouguereau's faces and you'll see it used a lot.
Notice on your reference photo that the corners of the mouth do not come to points, but disappear into shadow. It can add a nice softness to the mouth.
Of course, you can't use it willy nilly. If it's not there in real life, it might cause problems to add it. But on your subject, the shadows are there.
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