From what I experienced with a similar shot I think your problem started with the camera. Certainly I don't think anything can be done in editing. The white water was over-exposed and contains no detail ... perhaps the camera file has it but was lost with whatever you did in editing .... it does mean that likely the greeen water would go much darker but to me that is the price one pays for getting good detail in the water.
I like this image and find it to have an interesting contract between the violence of the wave crashing and the effect of the longer exposure on the splash.
I was curious about jcuknz's comment and downloaded the image to take a look at the histogram. It is shifted to the right and there is no true black in the image. None of the whites are clipped and the loss of detail seems to be more to do with the longer exposure than anything else imho. However, I do wonder if the green portions might be improved with a little noise reduction.
Although this image has a number of technical issues, from the standpoint of an interesting piece of art it works quite well Kelvin.
There is enough detail to understand the image and it has interesting action. In addition, there is a sense of what is going to happen in the next second or two and the mystery of whether or not the photographer is about to get soaked! The colors and lines leading the eye around the scene work well so IMHO compositionally it works as well.
I can see this framed and hanging in a public place with folks stopping to explore the image as they picture themselves in that situation. For me it works well as an abstract and is a definite keeper.
Thank you everyone for all the great comments. My intention in this image was to create a piece for display. Matted and Framed this piece looks wonderful and is currently in a local gallery, the length is 48". It gets a lot of attention. I think if the image included some golden hour colors it would add considerable drama and mystery. As mentioned above, there is a lack of detail in the whites but this is due to the slow shutter speed, there is nothing blown out! Most of the blacks were taken out in order to bring out the Emerald Green of the water. Again, thanks for taking the time to comment.
Kelvin,
I like it very much and also opened it up in ACR just to have a look with respect to detail in the water and as you mention there's nothing blown.
A trick I read about for clouds is to use the recovery tool in ACR to enhance them and this also works for the water in this image. Not suggesting for one minute that it needs it and it's something that depends upon personal choice, just thought I would mention it.
Good luck with the one in the gallery.
Grahame