You should try this picture in black and white of HDR faded. I think it would be a little more dynamic, but overall very nice image. The trees show a great contrast to the model!
I like the idea of doing yoga in nature. But this nature is very distracting. I think a shallower DOF would do wonders to help focus this pic on your subject.
The author missed a great opportunity to evoke the serenity of doing yoga - with a little tighter crop at the top, a different angle on the model in which the model assumes a similar posture to the tree in the background (curved arm over the head similar to the branch with the lower arm matching the lower tree branch) it would have envoked a feeling of power and strength along with serenity and grace - all the things yoga is about. A good effort.