Agree with the others that this is a rare and beautiful look at this bighorn. You are overexposed in the whites on the histogram and it shows in the grass and the lightest fur along his back. If you shot this in RAW you might be able to pull some of that brightness back on the fur and then bring up the darktones of the face a bit more. I think the grass is a wash though - it's so hard to pull that back when it's that far blown.
Possibly some fill flash to lighten his face and even out the scene a bit more would have helped but with light this harsh it's hard to tell.
You did a very nice job on composition and crop and the choice of aperture seems to work as you got good details in the sheep from front to back.
Here's the raw image reworked. I was able to tone down most of the highlights through recovery, SH and selective exposure shift. Cloned some dirt off his back-side, denoise in topaz, USM.
Joel - he was very cooperative (for a while), about 75ft away. In a short time he gave out a snort and went over the edge.