It's a beautiful swan, it's plumage looks rather soft. I personally think you cold have pulled back the zoom towards the 250-300mm range to include a bit more of your subject. Good parallel head angle and nicely blurred BG.
Jon, I like these tight portraits but agree with Dan that a little more of the neck would lift this. Otherwise, a really sweet shot with lovely detail helped by the soft light. I'm guessing these have a yellow/warm tinge as shown as I'm not familiar with the species. Background is great too.
Hi Jon, you have really brought out the detail on the Swan, exposure spot on too. I like the creamy colour to the Swan, and the Swan pops well from the smooth BG.