The second one is very beautiful. I love the black and white choice, because the contrast is wonderfull. Love her pose, love the shadows, love the background choice. Be proud of this one!
The other two are nice, but she gets lost in the dark background on the first. You need a tad bit more light on her face, neck, and arm and it would work.
The lighting is very nice in the third but it lacks the gracefulness the other two have just because you have only part of her in there. I might like to see it in black and white. Sorry CCericola, but I don't agree with her on crop the third. Please don't. I think the crop you have works nicely. I love the negative space. I think you could add the gracefulness back into the shot if you had her stand just as you had her, only she tilted her head back and gracefully lifted her right arm the same direction, if that makes since.
Anyway, beautiful beautiful shots. You are very talented, and I love the subject matter you chose.