Looking at your shot back in #1, your use of depth of field works, although the stone in the background is still a little distracting. The photographer normally picks the clothes for a model, and if you did that here, you picked the wrong clothes. It is almost impossible in an outdoor shot to get a white dress, looking sharp, accurately white, and not a little over-exposed and washed out. A pale blue or any other pale colour would look better and be easier to shoot.
A general guideline for shooting models is that the centre of interest is either the face or if shooting for fashion the clothes. When it is the face, as in here, upper body skin is a visual distraction, as well as shoulder straps, boney shoulder etc. A simple blouse would have worked better. The manner in which her right arm is folded in and cut off by the body emphasizes a boney, skinny upper body. Her other arm is almost cut off at the elbow which is also not done in serious model work.
As already mentioned, the focus is not as sharp as it could be and the lips definitely need some work. The hair could have used a few extra combs and placing on the right hand side as well.
A very pretty face with great hair which needs to be flattered by de-emphasizing some other visual issues.
Perhaps more thorough than you wanted, but hope this helps.
skieur