Nice image, actually I do like the framing of the Duck Ė it looks like its going somewhere.
The Reflections are good, though the water has too many ripples to appreciate it.
Colour is nice, but does not pop out of the page.
Iím guessing you took this at the longer end of the zoom range with the duck quite far away, this has two effects,
1. the image is not quite as sharp as it might be probably due to camera shake which is magnified at longer focal lengths, it also might me due to the lens itself being not so sharp at wider apertures Ė f5.6?. Could try using a smaller aperture, often f8-13 is a sharper area in the lens.
2. the aperture and subject distance dictates depth of field and the water in front and behind is in focus, if you were closer and the aperture was larger (trade of with point 1) then the blurring of the water behind would make the subject stand out more.
In the Mod, Iíve increased the contrast to add more colour (actually over done it to show the point), resharpned it (auto sharpen) to make the duck clearer. Then added a vignette to bring focus to the duck itself rather than the water around. Just to be a pain I added a simple border.
I'm not trying to take away from you initial picture just throw out a load of other optional ideas.