Wow... great shot... composition, color and timing. I'm on the edge with the applicability for the challenge though. I want to say that the gace is the flow that my eyes follow as I'm "walking" around your work. Good work.
The movement of the stream is graceful, as are the trees. If the graceful movements refer to the person, he or she is too far away and small to be the main subject - though it makes a good focal point.