I have seen this beauty species posted before, maybe it was you, Girish. Excellent image, nice looking back pose, showing off the nice irridescent green back.
excellent shot of a species that is tough to photograph. Also not easy to get such a clean BG behind it. Well done on all counts. loved the DOF coverage. awesome colors. If mine, I'd move it a tad to the left in the frame.
A super image of a super-looking bird. Personally I'm quite happy with leaving it where it is in the frame. To me the overall image looks a little dark, and I might consider increasing the brightness a tad.
Composition is fine. The bird has superb plumage colours. Detail excellent. You started off with low light, adding luminance would in my humble opinion make the image appear unnatural/pasty and kill the mood.