I love the estuary, horizon and sky, but the foreground brush is throwing me off. Just for yuks, I brought it into PS and cropped out the foreground and the result works for me.
I love the graphic horizontality of this image. I agree with Harley … but not entirely. I would try cropping half of the brush from the bottom. Right now I think it is too dominant and not interesting enough to be so. But essentially, you have layers of light and texture and I think a smaller layer of brush could contribute.