C&C per req:
1. I like the composition here, but I'd prefer to see head angled just a little more toward the camera so that her eyes aren't looking so much to the left. I'd also just dialing up the light on your secondary light just a hair... maybe 1/3 stop. The shadow across her eye is a bit annoying. Also, make sure she smiles!
2. An interesting image, but the lighting is rather flat and uninteresting. I think this would have HUGE potential as a B&W if lit just a little differently. I'm thinking dialing back the key light and then adding a snooted secondary at low power to produce some deep shadow.
3. Ehhh... this one does nothing for me. The background is busy and distracting, the subject is under-exposed and she doesn't look happy.
Just my $00.02 worth - your mileage may vary.
~John