I like the colors in this duck, and that you have no competing colors in the background. It looks to me like the photo isn't quite level, perhaps a degree or two of clockwise rotation would straighten it out. I'd also consider cropping to eliminate the larger bright rock on the left side of the picture.
Sharpness looks good for the shutter speed and so does the angle and eye contact. I agree regarding CW rotation and find the big rock distracting. Maybe a bit more contrast and a slight crop off top and bottom?