Seth Kinman was the Buffalo Bill Cody of the mountain men. He shamelessly promoted himself to every photographer that he could get to take his picture. He marketed himself to at least a couple of presidents with wild primitive chairs made from Elk antler, and rawhide. And, his wild hair, outlandish outfits, and oversized knife, became fixtures in drawings by Frederick Remington. Kinman probably did more to mislead historians interested in the late fur trade reguarding the overall appearance of western fur trappers than any other person of the time.
That being said the picture you seek is available on the net. I have seen it reproduced a couple of times, but don't remember the specific sight.
Hungry Horse