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You have chosen a beautiful subject and done a very nice job with it technically. You used the long shutter speed and I assume a tripod to get that flowing look to the water. There is detail in the shadowed rocks, which can be tricky to do with digital exposure. I applaud your effort by lugging the right equipment to a great location.
If it were my shot, I'm not sure I would have centered it quite so thoroughly. Compositionally, I've been trained to think about the rule of thirds, and to place the main subject off-center for more interest. The diagonal line of the rock projection saves this from being too static, but I'd like to see it cropped some on the left side. My humble opinion only.