Hi Chris - nice effort given the difficulty in prevailing conditions
Did you run your raw through DPP? You said critique was welcome, so I took the liberty of running your low-resolution JPG through DPP as a JPG, and still think that the contrast gives a better view. I'd like to have had your high resolution raw - it would give lots of room to move. I also cropped the frame a little to make it look like the bird was "going" somewhere - i.e. into the empty frame to the left.
Got to get me one of those lenses one day... arghh...