Looks like a very beautiful bird and a very challenging shot. I don't have the knowledge to be technical about your capture but the first thing I would suggest is a better cropping. Maybe crop the right side more.
Hi Farhad! The near wing and the fanned tail look great since it's catching some nice light. I wish the rest of the bird were also as well lit, in particular the head. I also wish the far wing was more visible. From a composition standpoint, I'd like to see a tighter crop that emphasizes the bird more and the BG less. I would also crop from the right, placing the bird in the right of the frame. That way the bird has somewhere to fly to. Thanks for posting!