Nice pose with good eye contact. I like the bird against the dark BG. You've got a steady hand to pull off 1/40 at 420mm, but I would still sharpen the bird just a little more.
Striking image because of the dark background. The one downside is that the beak does tend to blend into the background a bit. As Doug mentioned, it is a bit soft, but considering the shutter speed and magnification, you did well.
It would be interesting to hear the story behind how you got so close to this fellow!