Pretty welll taken shots I must say. Model is great too. Lighting is perfect.
I always give the good stuff first. Here comes the bad ones. ;p
Pay attention to the details, since you've mastered the basics: the bra strap is extremely distracting. It stands out distinctively in your pics. Draws away attention to the beautiful Caroline.
As what many have mentioned, the coloured contacts.
Thirdly, model's expression. Looks like she has just started her career here. Given more time, I'm sure she'll shine. Caroline, it's not just about posing and smile. You have a part to play when it comes to shoots, besides taking instructions from the photographer. You're like an actor while the photographer is the director in a movie. Good director + lousy actor = lousy movie. Lousy director + good actor = lousy movie. Lousy director + lousy actor = no need to say. Good director + good actor = popular threads in CS!
Lastly, I'm sure TS has a lot more poses that these. Only head shots? :think: