Kostas, yes it's a fly. It looks like one of the biting types or at least it looks similar to the evil biting deer flies that we have around here.
Was this image lightened a lot? I'm asking because it looks like there's a big amount of color noise and at iso 100, there shouldn't be. The dark area in the LR is distracting so maybe give a try at cloning it away.
sorry im not so sure about what i did , as is not so new images this one , the sure thing is that it wasnt dark , i remember this pretty good , thanks for the replys and the infos any way . :)
It does feel a little over processed but you sure brought out the colors in the fly, Kostas! I'd work on bringing the BG down a bit and cloning out that corner and I think this would really pull the image up another notch.