When rummaging through the submissions on here I often get surprised at the high quality of images posted to us. I don't claim to be an excellent photographer but I know when I'm looking at something special and this just jumped out of the pile!
The water scape falling into marsh, to mountains and a menacing looking sky are almost enough on there own and a lesser photographer may well have settled for just that and would be ritefully pleased.
However you have shot this with 2 added focal points that have rely set this photo off. The fisherman left of centre is correctly positioned and adds interest without overly detracting from the landscape. The second is the little group of ducks in the bottom right giving a little cheeky reward for anyone taking the time to look closer at your artwork. Its almost like they creped into the frame to see if they could get into the shot :-D
Exposure wise there are some blown highlights in the water but looking at the hedges and boat I don't think you could have stopped down any further without killing detail else ware. A polarized filter might have helped but you would probably have lost more reflection from the water than you wanted.
All in all, Fantastic! I would be very proud of this if it were mine.