I think it's a great shot overall. The composition, pose, and lighting are all good. All the fundamentals are well represented.
I agree with Mr. Bautsch on a couple points: It appears as though you've used either soft focus or some sort of smoothing in post-processing. This is good for skin, but takes some of the sharpness away from the eyes, which should be the focal point as mentioned. On a positive note, the catchlight in the eyes is excellent! Second, I'm also seeing hints of color. This has more of a vintage look than a true B&W. It looks good and I like it, don't get me wrong. But if you're seeing this as B&W, your monitor may need calibrated.
Things I would fix: There are a couple stray hairs in her eyebrow. Those could be easily edited out. There is also a stray hair tucked into the corner of her mouth. Her dark hair and the lit side of her face are exposing quite a bit of facial fuzz that can also be smoothed out. Women really notice stuff like this when looking at photos of themselves.