Here is my go at it:
I did a couple layers one with glowing edge and color dodge 30% opacity to try to bring the halo around the center cows head into more prominence. I also obviously removed color from the rest of the image and edited the hue/saturation of the center cow. I will keep more detailed account next time, but I'm at work doing this

Added some noise in there somewhere too.
__________________
I'm using a Canon Rebel XT with kit EFS 18-55mm lens & Tamron 18-200mm XR Di II & Canon f1.8 50mm...
I want a decent hotshoe flash unit , more lenses, more cameras, more more more...