Well, when you finally got the chance, you certainly made good use of the opportunity! These are excellent for a first attempt. Or a second. Or any other number of attempts.
The ONLY thing I'd suggest to improve them is to watch your composition--you've got the Osprey smack in the center of every shot. If these were mine, I'd:
Make #1 a portrait orientation.
Crop just a bit off the left side of # 2, to put the Osprey on the left "third" line, since he's looking back "into" the frame.
I might actually leave #3 centered, but crop off a bit from both sides to let the bird fill more of the frame.
Crop a bit of the right side of #4, to put the bird on the right "third" line.