This isn't my favorite of your works, to be honest. The light is kind of flat, not as dynamic for an action shot like this. I also would have liked to see her wearing black shoes. You lose the white shoes to the white background. And her expression is a little too posed. As a runner, I know that I never look that happy. What exactly was this for? An advertisement or event? Or just a portrait. I suppose the context would give me a little more to go off of. I do like the composition, though, and the exposure is spot on. I've been loving all of your other recent stuff. Keep it up, I have learned a lot from you!