Wow. I don't know why you didn't make this bigger as the incredible variety of light and texture is quite astonishing here. You've even got some birds into the mix as well. Awesome work.
I would have thought this was a long exposure, except for the birds in flight. I'll be looking for some details on how you did this after the challenge.
The birds really add to this photograph. I would be tempted to crop out half of the rocks at the bottom so that it doesn't distract from the dock and the birds. Love the mood in this one. Excellent shot.