Is this cropped at all? Pic seems a little pm the small side, and the swan makes up only a little of it.
From what I can see, focus seems good, a little motion blur on the wings is a nice touch, and I like the trail behind!
The crop seems off to me though - not sure if it needs a bit off the top or what really! As the background is bland I think maybe a tighter crop would be best, but not 100% sure honestly, maybe worth a play?
Overall I like it though
Not sure i agree with you (no idea how to shoot birds) i dont think theres much wrong with the shot other than getting closer to the subject.