Michael - Nice study of gray tones (white dress?). Good use of depth of field control on your 50mm 1/8 lens.
However, this one hust doesn't have the pizazz that I've seen in some of your others (or it is a really bad scan or my monitor is dirty).
If this was a posed shot, I'd wish there was more detail in the face, or if you want to keep the face turned away, more light on the face (closer to the window?). Hair looks a bit dark and monolithic to me as well. I'm guessing that the print has more range that you can show here?
On the background the chair-rail is a little distracting to me... on the other hand it does give it a little of the street shot flavor.
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