Nice! Interesting shots, I like the lighting in the first one the most I think
The lighting in te second works too, but for the level of fall off I would be tempted to crop some of the dark space to the right of the frame... But I don't know anything about the client, the might be a very good reason for having that space there?
I like the third from the top down to her collar bone where the two shadows intersect... The shadow of her chin across her shoulder is a touch distracting for me...
BUT, I'm being really picky! ... I hope you don't mind? I'm not the greatest studio photographer in the world, but once you have done a bit of it I think you find your self knowing exactly what you like an seeing deviations from that is quite easy in other peoples stuff... Do you know what I mean? I'm certainly not saying my opinion is right, just pointing out where it perhaps differs from yours ...
I think that probably sums up this forum really ...
Anyway, as I say, hope you don't mind the critique