You have nailed this one Allen. Great action stop shot. The lighting is very good and exposure seems to be spot on. I like the way that you have captured the insect with most of the face showing. Nice clean background to emphasize the sharpness of the bee. The insect is nicely positioned in the frame. Lovely shot.
I have just acquired the Sigma 150 mm and find that it is an excellent macro lens which allows a good working distance. I have fitted mine with the Sigma 1.4x TC.