The colors have been way to overprocessed. The water is too blue/purple and the green is way too saturated. Taking out the long exposure of the water there is nothing interesting to this photo, no clear subject, statement or point. With long exposures you need to remember that the effect of the long exposure is not enough to create an interesting picture. You need to consider composition, framing, lighting, etc. Light trails from a car, running water, and other things that change appearence with long exposures are boring unless there is something unique about the overall photo. Had therte been a bird/animal on the rock that would have added something to this photo, had you gotten real low close to water level that would have been a bit more dramatic, had you got into the river and shot down the river something more interesting may have occured.