This is a fantastic shot- the fly is incredibly crisp without appearing noisy and the color-use is amazing!! My only suggestion would be to stray awa from centered photographs. When the artist crops a photo so that the subject is out of the center, you consequently produce a more eye-appealing piece- the photography rule is known as the Rule of Thirds (not sure if you've heard of it or not but [link] is a write up to briefly show how it can be utilized).
thank you for the lesson.. in the original file, i dont place the fly in the center of the photo, well, because beside of the fly it self, and the branch, it's empty, just a background with green color. i crop it tightly, so the fly looks like in the center.
once again thank you for the leason, i'll use it for next photograph.