Tough shot - the light does a great job back-lighting the butterfly's wing, but blows out the flower. Nice use of DOF, but the butterfly nor the flower is in focus - looks like the focus was on the stem below the flower.
nice timing, its so difficult to capture these kind of shots. That said, I know its difficult but I wish the butterfly was more in focus! I would have cropped this shot differently as well, with possibly more room on the left.
Moment is allright, but I would suggest photographing in the shade or when it´s slightly overcast for these type of photos, harsh midday sun is perhaps not the best light for this subject, it rarely is for any subject for that matter.