i really like all the lines moving throughout the pic. i know it's probably going a bit too far but i wonder what it would look like if you converted it to have just 2 main colors. the green just feels overpowering to me, and just a single blue and sand color would allow the sky to merge into the water... maybe too artistic looking. nice capture as it stands.
I have a feeling this image could be so much better had you lowered yourself to take the photo from the level of the man and his dog, this way it seems a little flat and not enough sky..