Nice photo. Pretty girl, pretty photo. Shooting down along the length of a wall or fence is called "skimming", and it gives a nice feeling of depth and a leading line. You did the technique well--not too much out of focus foreground, not too little out of focus foreground,but just the right amount.
The only thing that distracts me slightly about this shot is the blown out highlights on the wall and the back of her neck. Other than that it's a beautiful shot, good work!