This is really an excellent black and white portrait, in my opinion. Your model is lovely and fashionably clad and attractively made-up. If her looks were enhanced through editing it's seamless from reality to my eye. Great example of a lying down pose, attractive arch in the neck and turned head keeping the eyes centered in their sockets, avoiding the all too common and self-induced asymmetrical eye appearance. Excellent use of depth of field in both foreground and background. Last but not least, though practically the most obvious - is excellent black and white conversion. Great tones throughout the entire range.
I like to include some recommendation for improvement in my critiques, and must admit it is difficult for me to find something of any significance to do so with this image. The only suggestion I can find to offer might be to edit out the smokestack/lighthouse found just to the left of the model's upright forearm. To be honest though, I believe that I only noticed it because I was looking for something worth recommending.
All in all, and excellent example of portraiture - great work.