Wow Ann! Very nice work. That lens is really paying off in dividends now isn't it lol.
I would suggest a few minor post corrections that would make these images REALLY pop. A slight shadows and highlights adjustment would eliminate some of the minor highlight blowouts and really make the bird POP off the background.
A slight curves adjustment (or levels) would have a similar effect. I can post my version of your shot if you would like to see what I mean by the adjustments. Just let me know.