Did you do a hue adjustment on the sky? There is a line at the horizon that doesn't seem to be either sky or water. Maybe your adjustment layer for the sky included some of the water which made a different colored line from both.
The composition is great. The concept is not ideal for dichotomy but works at a stretch - the big problem here is image quality (sky gradation provides the starkest example - put the darkness up on your monitor and look at those jaggies!!). This is the fault of the camera not the photographer, though I wonder what you are using to resize and save your jpegs?
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