Stunning image with beautiful lighting and wonderful pose. It is so nice to be able to see the swallowtail so clearly and I love the BG in this capture Ken. A little more head turn would be nice and I would be inclined to crop a little more from the left to remove the stump or broken branch. Wonderful capture and thanks for sharing Ken.
Such a beauty, love that tail! I agree with Judy's critique. I really like the colours, and also like how the bird is perched near the tip of the branch :-)