Wow Stuart, this butterfly must have just emerged - it's in perfect condition! The butterfly gave you a nice pose showing off those wings, I like the diagonal of the perch and both subject and perch are very sharp. I think a couple tweaks would put this one over the top. If this was mine, I would crop a little off the left and either clone or use a quick mask to remove the OOF plants in the LL area of the frame. This is such a strong image that I think a little extra work would be well worth the effort!