Well done for capturing the insect in the open and so well posed. I often see these but they are always deep in the grass and impossible to get a clean shot. Lovely clean background here and a perfect flower head for a perch. The insect is perfectly sharp and well lit but I feel that just an ever so slight turn of the camera to the left may have given greater DOF to the head region. The insect seems to be ever so slightly turned away from you to the right.
Nice details, colors are very pleasing and I love the flower he is on. I go back and forth on whether I would do a little bit of lightening up the image a little or not.
Wonderful shot, the fill flash is well done. It hadn't occurred to me independently, but perhaps Warren is right about a very slight brightening would improve it, perhaps not, one would need to try the experiment.