One thing I don't think any of the commenters mentioned... you may have gotten a bit of a lower score because people might not have seen very easily the image's connection to the title. It makes sense but it is something you have to think about for a moment, which unfortunately tends to be a negative thing when it comes to score.
A good idea, ducks running the rapids. However, it is way oversharpened, and some of the noise got sharpened, so it looks noisy, too. You might go to the forums and search for threads on noise reduction and sharpening.
Those ducks must have really been moving! I say that because the water spray is frozen by the shutter speed, yet the ducks are blurry. You have pretty good color in the area around the ducks, and the rocks are nicely detailed and sharp. Good luck in the challenge.
Quite noisy. Did you overprocess the sharpening, or is that camera noise from a high ISO? Also, the subjects get a bit lost in the complicated background.