I'm not a portrait photographer. So I cant provide too much critique, but I will make an attempt.
#1 the BG compliments her attire, and is nice and creamy. If I had to nitpick I'd say watch the shadows on the left side of her face, but overall its a very nice portrait, that I would be happy with, as a photog and as a recipient.
#2 the pose is nice, the lighting is nice except for the shadow, unless oyu want that. But the top of her head is cut off, it's not that bad per se, but it's the first thing I noticed.
#3 is a beautiful pose, and looks good in B&W.
I know shadow is needed or it'll look flat, but I think a bit of fill would do wonders. Like I said however, I am not a portrait guy, so take whatever I say with a grain of salt.
She is a very pretty subject.