Almost a fairytale, this picture, and I love it: the colours, the uneven bokeh that surrounds your model with care, the pose, the fearless couple of leaves on the right . . Although I have one minor point and that is the white spot above her head. It does not ruin the shot and the ones on the left even enhance it, but somehow the one above is a little too big to me. Anyway: if this photograph did not touch me, I would not care to comment on it - I love it!
The awsome light is mainly due to the overcast day and the location somewhere in a slightly shady place, hence the lovely shine in her hair. Although I am not the author of this wonderful artwork, I have some experience with this kind of light and encourage you to experiment in this area. (Just carry a silver or white reflection shield or something like that.)
Mann this is so amazing, what kind of lense did you use? did you got softboxes with you? I have a Canon 450D with a 18-200mm lense, but its always too dark to make good photos. I might want to buy another lense with a smaller aperture.