Very clever composition. I do wish the person's face didn't look quite so masklike ... I think I would rather it either have more detail or less, but what it has is reminding me uncomfortably of a killer in a horror movie. Sorry; I get imaginative sometimes!
I'm guessing you used the diagonal angle to inclued more of the top of the model. It would have greately improved the shot. The umbrella & the tree in the reflection leave me with a feeling of imcompleteness. Beautiful reflection!
Simple and nice. The diagonal crop works really well here. I wonder if it might be even more impactfull (not a word, sorry) if the colors in that beautiful umbrella were boosted and brightened even more?