Try moving the plane further away and scale it up if you need to, Just to see if the dof works.
Have you used the measureing tool to work out the correct distance.
Do you have the whites of the wings set to glow? doesnt quite look right.
Also i think you should a transparency map to your butterfly, this would add more realism to it.
Looking good, keep it up!
There's nothing normal about normals. In FACT i think the are abnormal.