I think this image has potential, but there's too much going on in the background, and the subject itself is pretty dark. Could you have positioned the "butterfly" (it is a prop, right?) in maybe an outdoor location? That would add more light and give a more natural background.
Not terribly symmetrical. I think showing the butterfly true to vertical would improve the appearance. The image is not very clean either... there seems to be some noise on the window. The right wing is also quite a bit lighter at the bottom than the left one (I'm sure you've heard that a million times). The colors are beautiful, but the general image needs to be honed a bit to look a little more finished.