As a stitch, this was rather easy. All the objects were far enough in the distance, that doing this hand held presented little problems. Personally, however, I liked the sunset one better:-)
What an absolutely stunning image. I've just returned from the Southwest and got some Canyon shots as well. We never had a chance to get up by Horseshoe Bend. Wish I had. But technically this is a jaw-dropping shot.
My only suggestion to you would be to tone down the signature. I know you want to prevent people from stealing the image and with the quality of your work I can see why, but shrinking the signature even a little will improve on an already great image.