Good use of negative space but to really get the full impact of it, I would have cropped the top of this shot out entirely. Make it all water and dog. The fact that his eyes are in focus speaks to excellent timing and his position within this photo is great composition, but I would definitely crop the top.
A little unrealistic in the colors. But it's an interesting way to go about processing. My son loves the dog in the water... he is sitting here telling me "I want a puppy like that". So he loves the photo. :)
I also like the idea of it, the ripples in the water. I just think it went a little overboard in the coloring.