My overall impression is that you need to work on simplifying your shots and waiting for the right pose. This first shot appears sharp and has good color, but there's a lot going. Even more so in the second photo (try cropping in just on the bird that's in focus and adj. in the contrast a bit). The third photo lacks the business of the other two (a good thing) but its a bit tight in the upper right; i.e. I'd like to see the space that's behind the duck in front of the duck.
All in all, some very nice shots for someone new to wildlife!
