Basically this would be enough of a critique, but ... you know, 100 Words. One more thing - basically for "Impact" I would love to give you 6 Stars!
Well, firstly I do basically like everything about this picture - The depth of field, the focal point, the composition, the colors (especially that the background is really smooth and works well with the foreground...), the format and your use of the format.
Still there is one thing I can advise you to "change". I hope you took the picture in the RAW format. The butterfly is too bright. You should try to bring in some contrast and texture in it's wings. But with the RAW-Format post-production that's a thing of 5 Minutes.
The colours are the best about this photo! The contrast of the White Butterfly and the Background is just stunning. From my Point of view the butterfly's a Little bit too bright and shining.. but well done though