This is a beautiful photo. There is a lot of captured emotion, I can really feel that there is something she is holding onto inside of her. The lighting is perfect, the colour is wonderful and I love the grainy noise. This would also look amazing in black and white.
With that being said, try cropping the picture so that there is less negative space on the right side of the model. I think doing so would force a stronger focal point to the expression of her face. It gives the model more visual weight, and helps with the eye flow. Other than that, it's wonderful.
the beautiful natural light softly traces her face then the back light is just enough to trace the outline of her jawbone up to her ear freckles shyly appear on her face and upper breast as she clutches her nightgown, a look of introspection on her face. this would make a fabulous painting, and is a gorgeous photo!