Firstly, I love the low depth of field you used by opening up the aperture. Secondly, the color contrast between the reddish orange butterfly wings against the green (blurred) background is excellent with a splash of purple. You could not have choreographed a better setup. Thirdly, I like the composition of the shot. You positioned the butterfly in such a way that it draws your eye to it but not in such a way to not allow one's eyes to recognize the environment. I can't think of a thing that you could have done to improve on this shot. Excellent.
Thank you very much! I'm a fan of the colors too. I can't believe I managed to take this shot in the middle of an ugly downtown construction area. This monarch was just chillin on a branch in the police station's garden.