Michael,
This is outstanding. I really like the horizontal lines about 1/3 of the frame up from the bottom. I also like the fact that the shadows are not as deep as some I have seen.
Lovely image and nice placement of the elements in it. I would like to see the highlight at the top brought down some.
The slot canyons are a prime candidate for HDR. Not a nit, just general information to all. Michael did exceptionally well with a potentially high-contrast scene.