Opinions on this picture?

Hi :)
I took this picture today whilst out on a walk with my friend and I'd love to hear peoples opinions, constructive criticism, etc.
I took the picture with a 50mm f1.8, shot wide open because the background was quite cluttered.
I did some light editing in Lightroom and then colour graded the image in Photoshop.
I positioned my model in the best light I could find (diffuse and soft but not casting the colour of the surrounding plants onto her).
The portrait was taken in natural light only.

Thanks for any opinions :)