Composition/Content: The ripples in the water and the position of the duck show motion. The diagonal is good. The point of focus of the photo is the rear end of the duck and the orange feet of the duck. This is where my eye lands first. I would have liked to see the picture cropped so that most of the water on the left and bottom was not in the frame. This would have moved the point of focus closer to the head of the duck and the direction it's moving.
Lighting: Lighting is good. It looks like you might have used a polarizing filter or the lighting was even from an overcast. No glaring spots.
Background: The water is clear and blue.
Camera Work/Technical: Exposure is good as is focus.
Digital Processing: You might have brightened the picture a little making the duck a little brighter white, and saturated the blue water and orange feet just slightly.
My Opinion: I think with brightening the picture and cropping to put the duck crossing the photo rather than apparantly leaving the photo would have given this photo several more points in scoring.