Your butterfly is beautiful and I believe she would have been enhanced greatly if you had a bit deeper DOF here. While her wings are in very good focus, her whole body is not and I think that is hurting this image a bit. Also, giving this a bit more headroom might have been a better choice. It would have given us a better area of bokeh and placed her better within the frame. As it is now, it looks like you tried to center her but failed. Your leading line takes me right into the photograph and then right back out. Maybe a crop to take it out totally. I am a big sucker for butterflies though :) Good luck in the challenge.