One from a recent trip. I was probably within 5 - 6 meters of this bird, but being small, I did had to crop the image. I hope I've done it justice.
As always, I'm eager to learn and improve, so comments are always welcomed.
7D, 100-400mm @400mm, ISO400, 1/1000, f5.6
Looks like it held up well. Might take a bit more off the left and right sides. Great DOF. I'm loving the details in the bird and the stones. A sliver off the bottom might help as well , as the oof stones tend to draw the eye away from the main subject. You have the right idea. Just needs to be tweeked. Stay with it.