Beautiful picture. The only thing lacking is a bit more originality as there are a few images using this theme. This one has great focus and sharpness to it, and good color contrast.
Good representation of spots. Looks like this got pushed pretty hard in post-processing. It's over sharpened and appears to have some major noise reduction applied. The focal point is too far back to get the "face" of the butterfly in focus (gets crisp at the front edge of the wings). Nothing personal, just some observations. Good luck in the challenge.