Great photo, but I would have liked to of seen it from a slightly different angle so you can see the side of the fly and maybe not centered. Like you said thouhg it was a fly so you had to take the picture quick. I really like it.
Have you tried to brighten up the body of the fly using a levels adjustment mask or something of the sort? Great picture the bold colors of the map make for a great background
Too little info asked for to keep this in Photo Critique, though, our guidelines say you've got to be very specific about the kind of critique you want for your photo there. It'll have to move to the General Gallery.