Beautiful! I was going to comment in your mushroom thread that depth of field (DOF) was impacting the sharpness of your images, but others already had. (Basically, your depth of field was too small to even keep a single mushroom in focus.) I can see in this photo that you made the adjustment and it looks good! Love the creamy background and the butterfly is very sharp. My only critique is that the left wing goes a bit dark. You may have already tried this, but I would look at dodging it (lightening it specifically with a brush in Lightroom or Photoshop) or doing some shadow recovery or something. Basically, look for a way to increase the exposure of that left wing so it matches the right...
Beautiful shot though! Keep 'em coming!