To be honest with you, I like this image as it is. I might crop out just beneath the bright rock in the upper portion of the picture though. This image really gives you a good feeling about the water.
As a tip to achieve the sfot water result you are talking about, you would use a circular polarizer, or something to darken the image. Then you would want to stop down to at least f11 to force your shutter to stay open longer. Generally a shutter speed of around 1-2 seconds is good. Anything longer than that will yield very dramatic pictures.