What a lovely bird this is. The Brazilians call it "Maria-faceira" or "Mary the coquette". I have never managed to show the colors as well as you have in this image and I have also never seen it puff out its neck feathers like this. I assume that this is some sort of display and that you were in the Pantanal during the breeding season when the colors would be more vibrant.
I wouldn't change a thing.
What a superb looking bird. A very nice capture, indeed. With members from all over the world we are getting to see birds that we never knew existed. This is one terrific website.