I would try a square crop - though not my preferred option personally - or vertical? Not sure, as the perch is horizontal and it may look strange. However, I do feel there is a little too much negative space to the right.
On a postitive note, the image is well exposed, pin sharp and you had captured the height of the action so huge congrats to you for that! :)
Terrific call pose with nice detail. To me, it suffered by the dark head blending too much with the dark background, and like what David did to make a nice separation.
Thank you for the suggestions. I tried a vertical crop at first but felt the bird needed more space....the image is sized for an 8 X 10 print...posted image is just resized to 900 pixels on the longest side. I dislike square crops but tried it just to see along with some levels adjustments.
David...thank you for the edit but that's not my cup of tea...I know you didn't have much to work with but it looks too washed out. On my monitor and in the print there's enough of a separation of the head and background for my taste. I tend not to do much post processing to my images...too much and they aren't how I remember them when I took them. If they aren't up to par I will try again.