Hey Susan,
I know this guy!!!....he almost never sticks his head out in the clear!!!! Nice job getting him in the open! I do agree that it could be a bit sharper...but nice capture overall!
You're right about sharpness. I was very close with the 500. I went with f/4 because I wanted the BG to be OOF. Instead, the beak went OOF. I hope I've improved it with some selective sharpening.