as usual, take my ramblings with a grain of salt,
#1 - you are slightly taller than the girl, I think its important to get level to ensure you do not shoot 'down' on her - the frame on this one needs works imo, you have chopped off her feet and it feels like you are in no mans land in terms of the composition - how about cropping tighter, somewhere below her right hand. Otherwise take one step back and get all of her in teh shot.
#2 I like this better than the first, pose is better and the framing/composition more appealing, again it has a top down feel to it, getting level with her head would have been better imo.
#3 - hmm, I will leave this one atm - I have a vision for the PP on this that might work..
#4 - the favourite for me, I prefer the lighting in this one more than the others, all teh images are clearly staged so I think having good quality studio style lighting is also appropriate in this case! The lighting is all good imo correctly placed and balanced. The upper body pose and head tilt is on the mark too. As suren mentioned remove that bottle