Congratulations Glen. Great shot. I love the cub that is standing, and seems very attentive to what's going on to your right.
I assume that even with the lens at 600mm, and some cropping of the original, you were quite close, but presumably your guides knew what was a safe distance !!.
It's got a great composition, subject, and I do love that the little bear in the front is looking at you.
The edit is really dramatic - lost a little too much contrast in the surroundings IMHO. But still a remarkable image with edits that are just a little heavy-handed.