Very nice. Love the clarity and color of the butterfly, but, I don't really like the purple-ish color of the rest. You should have made it a light grey (lighten the rest using Levels, etc) which would give a great contrast with the dark butterfly.
Love the dark tones of this shot. Bug pictures are often too brightly lit for my taste. I also love how you shot shows depth and how the butterfly is clearly focussed. Good work. Among my favourites for this challenge.
Very strong image. The only thing I don't like too much is the rather purple duotone background, the color takes away some of the contrast/impact of the butterfly. 8