David the hoverfly is pretty sharp in the head and thorax, the plane of focus would not permit entire focus, I appreciate they don't usually fly at the angle you would have wished for. Image quality seems to be suffering a little, how big was the crop, maybe a smaller crop would make a big difference to the quality. The colours are good but I would suggest a tad more "pop" to give some contrast. (Selective colour or a curves adjustment).
Not an easy shot to get - congratulations for nailing the fly in flight! There are a few things that may make the image even better - you might consider cropping a little off the left. I would also suggest doing some NR on the background to smooth it out more. I'm noticing a sharpening halo around the fly. Backing off a little on your sharpening would eliminate that. Overall, this is nicely done and worth a few tweaks to put it over the top!