I think it really depends on how you are processing the image to b&w within photoshop. After doing a couple of quick edits of your b&w version, I came up with the attached. I darkened up a few spots and lightened up her face....nothing major.
The original looked a little flat IMO, that and I prefer a tighter crop as well
EDIT to add: Depending on what I'm doing will depend on how I'm going to convert my b&w image. Sometimes, I really like to use Greg Gorman's version
http://www.gormanphotography.com/bw_conversion.pdf (PDF file)