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OP, look up Helmet Newton. He changed my world for portraits and their composition.
Personally, high contrast will always be the king of B&W, get your flash pumping away.
Finally, give her something to do! Use your strengths ;)
Also, starter tip: have them remove clothes 5-10 mins before you start shooting. Your early shots have bra lines on her skin. Not nice. Use the time for a coffee or some rough posing.