I agree with Elk Guard. The slopes making the ruffled neck feathers and the grilles around the eyes work really well. It's impressive what you've achieved using lots of real bricks on this beautiful bird.
I kind of like your other birds more, but purely for the colors that they are. This is still amazing and looks great, especially with how you have made a stand for it that looks like something you would find at a wild life preserve center. The detail of the layered feathers really do help give this more life, I need to attempt some more sculpture stuff and see how lifelike I can make something.