I generally like the colors in this, and it is also a very sharp image. However, if I may give a little CC... I find the composition a little too square (the subject in the very center of the photo), putting too much emphasis on the foreground. Also, there seems to be a lot going on this shot (with the flowers and bush and trees and the rocks and the pond and the house...) and everything is pretty in focus, which I think distracts from the subject. I think this shot might work better if you narrowed the DOF a bit to really bring out the swans.
Just my opinion of course. Other than that, great capture!