SImply fantastic! The ripples each have a subtle hue which lends much interest to the composition. Your processing left a bit of a halo around the subject which is not overall distracting but worthwhile to mention. But otherwise, top notch photo with sharpness and detail. 8
I don't like to have the bird so much in the centre a bit more to the right and lower would have made this picture much greater. Still it is calm and beautiful but misses this extra thing that makes the wow of a great picture.
I like the reflection of bird. The top should be cropped a bit further to remove the darker blue line. Also would be better if the bird wasn't in the direct middle.
the dark band near the top is distracting, but without it the photo would lose something... its a tough call but if you could do this over I guess more sky would be nice.
Composition way too centered for my taste but otherwise, not bad at all. Still needs something to really make it shine, perhaps next time you could try a polarizer to decrease the reflection in the water to try and bring some depth into the texture of the water? Just an idea anyway. Good job but not great either, would have ranked it higher if you had cropped away the bottom and right side and placed the duck according to the rule of thirds but I still gave it a 6 like it is, nice capture.