I also think a tighter crop would help to make this image pop. I love how you have captured the butterfly, and it is a really pleasing composition. I would also clone out the tiny red spot on one of the petals. Very nice.
Echinacea Purpurea always attracts butterflies and bees. Vertical cropping might make the composition better. Getting rid of the extra space on the left and the right would make this even more interesting.