James I think neither the blurred water from the long exposure, per se, nor the colour of the water, per se, are necessarily issues.
In this case the mix of the two seems, to me anyway, wierdly unworldly.
As I already said the photographic techniques involved are certainly not the issue just, in this case, the result.
I have seen many jaw-droppingly beautiful and inspirational images where long exposure has blurred the movement of the ocean.
There are many fine and discerning eyes on this forum who will, hopefully, also offer opinions about your image.
Personally, I feel, that an enormous amount can be learnt from images such as this that are so close to being winners.
Tony Jay