Riks, thanks for the original.
Having looked at it some more, something going wrong with the focusing somewhere as the finer details of the swan are lost.
As a side note, you may want to think about composition when taking pictures too. There's a few articles throughout the forum in reference to Rule of Thirds.
Anyway, I've had a quick play, here's my result:
What I've done:
Re-opened levels and boost midtones and highlights
Contrast boost using Curves and set to a shallow S shape
Adjust the Reds in the Midtones to produce a warmer feel
Cropped to tighter composition.
Unfortunately if you add any sharpening to the image it just ruins it, becomes too grainey around the head and the detail in the water.
Hope that helps?