A very attractive image, I like the butterfly position and pose. I sense the colour balance is just a tad out - perhaps a little too much yellow. With images like this it is almost inevitable there is a leaf of flower head out of focus, in this case the flower head on the left does not detract in my opinion, I think it helps to maintain a balance.
Hey Stuart,
I think it may be a bit bright overall and agree with Jon on the yellows. A bit of toning down the brightness and pulling back on the yellows may do the trick.