Wow! Magnificent. Why do they call it Nicholas Flat though, looks anything but flat.
I especially love the cactus flowers, I guess because they are so unlike what I see here in New Jersey.
Did you really take all those shots on one hike? If so that must be paradise for photography. My only suggestion would be that maybe you would benefit from concentrating on one subject for a longer period of time, and trying to take the best possible photograph of that one subject. It's almost like there was too much stuff there to really do justice too.
Of course if you are hiking with other people, you really can't stand there for three hours photographing one cactus plant. lol
Thanks for sharing, really enjoyed!