From my point of view you have taken a color image in flat lighing and converted to a b/w that to my eyes is way to harsh. If this is the same free Nic converstion plug in I have it's not a very good one. Also the upper right hand corner is blown out as well as having what looks like a creature in the lower right hand corner, should be cloned out. Also I don't like the black blouce, again to harsh at least to my eyes.
Mind you, it's easy to find flaws, my friends do that to me all the time, but they can't take a picture if there life depended on it!
I did try a couple things, channel mixer set to 60/40 a modest curves adjutment and selecting the blouse and making it lighter and I think it works better with that image, Im in the same boat as greg and bez, Im not sure how to post my version, be happy to email if you like.
Dave ps not saying my version is better, just a better starting point to my eyes.