Tried and tried, but I can't see any fish. Nice dragonfly though, and I agree about the spray and froth near the rocks, and you might add some disturbance in the water where the rocks break the water up. This would also serve to indicate the direction of flow, because there isn't much at present, and the angle COULD just be due to camera angle as it is. I do like this idea, it's a very interesting angle to choose.

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