Sharpness and details look excellent and the BG is great. The colors look great also.
The Bfly position up against the bottom edge of the frame really hurts the image. Normally this would be a perfect example of a vertical image.
Also when cropping its also a good idea to have slightly more room at the bottom than the top.
What they said. The first thing that caught my eye was the downward angle of the butterfly and it didn't feel right to me. I see others are saying the same thing. Otherwise, I think it is a beautiful image of a beautiful butterfly. Great color. Very sharp.