Mike:
I would never do a portrait wider than it is long. What I had in mind was this: the bow would divide the right edge of the picture into the so called Golden Section where the longer section is 161.8% of the smaller. You could do this on the other side as well with the height of the chair back.
I would also create a shadow on her left to counter balance the fact that she's positioned so forward and establish the space behind her.
Also I would use the profile with her hair pinned up. I tried but couldn't cut and paste it in the Paint Shop program I have.
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