Wow, this is such a lovely shot!!! The ice patterns are interesting and in a way the lines on the left help to draw my eye towards the ducks. The colors are just beautiful, the shadows are dramatic, and the composition is interesting.
The one improvement I would suggest would be to emphasize the ducks a little more. I definitely agree with the previous comments that have said that lightening them might be good. Right now they do seem to blend into the rest of the shot just a *tiny* bit too much. I think what you did in post processing seems good, so probably it would have taken a bit of a different lighting during the actual shot. But that might have destroyed the pretty shadows, so I'm not sure what would be the best option.
Congrats on top 20 and a personal high score! This was such a great image to critique - thanks!