This was a lucky come across on a sunny day, needless to say it didn't hang around too long so I only got two shots. Sharpened slightly and cropped quite a bit to remove dead bits of leaf and twig from the image.
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I find the saturation levels could be tweaked a little more, or maybe just an auto levels in photoshop for example, I am sure you could make that green a lot richer that way. The composition is very good fully following the rule of thirds.
Good positioning of the subject within the picture. It appears that there is too much depth of field. A sharper subject and blurry background would make the butterfly pop.