I think you're on to something with the second view.
My initial feeling was that the lines are all stagnant. The chin, lips and nose create a horizontal line, and the bra, lips, eyes and chair back form parallel lines that are very nearly vertical.
I wonder if rotating the image to create some diagonals might be more interesting.
I very much like these images, but they don't say 'boudoir' to me, at least not in the "traditional" sense, rather they're images that I would expect to see advertising perfume or other women's products.
The mirror picture looks great, but the specific position of her head is making what looks like a double chin line. Not very flattering. Oddly enough the angle in the mirror is beautiful.
Second picture is nice as well. Never really a fan of upside downy pictures myself. Technically sound though.