I like the sense of motion that this image captures, as well as the subtle colors, but the gray line on the left is a little distracting for me. Also, I think the duck is a little too centered for me personally, but cropping the left side of the image off just enough to get rid of the line would fix my only two issues with this photograph and would make it really spectacular. Congrats on getting this well timed shot!
This would have worked well if the rocks or background was solid and in focus, but the background is soft and therefore the movement of the duck really doesn't JUMP out at us.