With the Mod, all I've done is a few minor tweaks in 'Contrast' and 'Lighting' (as I felt the image was slightly 'flat'). I also gave it a bit of sharpening.
I turned my attention to the beak - with your image, I thought perhaps the black beak had been lost in the mouth's shadows - by using the 'dodge' tool on low I was hoping to bring it out...................I'm not sure if it has worked or not! Hopefully someone with a greater ability then mine will have a go and describe what I should have done!
The image as a whole is brilliantly timed, it's nice to see an owl doing something (other then staring into the camera!).
It's a Great or Common Eggfly butterfly (Hypolimnas bolina). Beautifully caught, although it's a little frayed around the edges of its wings. (I'm not sure I would have put such a heavy vignetting around the edge of the image, but that's down to personal taste).
Devon County Council have the policy of "All Ragwort Must Be Destroyed" (though I've noticed they are a bit more relaxed when it comes to their verges!). Which is such a shame when these gorgeous caterpillars and moths use it as food plants.