Hiking to Delicate Arch at midnight and during the winter is, in my humble opinion, the very best time to go there. Of course, living in Moag allows me to do that whenever I want.
Beautiful photos, reminds me of things I have left to do (I've been through the Utah area hitchhiking and on meandering road trips but haven't hiked there much, slept by the road usually). Another area where I lived and hiked a lot, the Ozarks, used to be desert canyon country about ten thousand years ago. There are quite a few rock formations similar to these but obscured by forests, not so famous. The Pedestal Rocks area in the Quachita Mountains is one of the best. Well worth a day of hiking if you're ever on Highway 7. Better for photography about ten thousand years BC.