The pose is actually interesting, erotic even the way she's straddling the bed; however it's hard to tell that that's actually a bed she's straddling.  At first I thout that it was some kind of moorish arched tube.  You need to bring the camera back a little, and highlight the bottom bed board's face better.  I think that in the fill light's properties dialogue, you can uncheck the shadows properties, and that shold help some with your deep dark corners.
DPH

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