What a lovely girl. I also like the black/white a lot for this but, to be honest, I find the rose very distracting and somehow out of place. Good luck though.
She is a cutie! But I don't particularly like the lighting. I think if this was lit more from the side, it would get rid of some of the harsh shadows caused by a flash or heavy frontal lighting.
Nice portrait. Why did you pull attention from the only interesting thing in your portrait? Not a big fan of selective desat. The B&W conversion is a little flat as well.