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Wonderful comments from all -- very helpful. I have concluded that landscape photography is actually quite difficult (and not really my thing). I tend to shoot for the features in the scene and not think enough about POV. The first image was tough -- the arch was backlit and the sky was bright with no distinct clouds. The best I could come up with, after waiting, was a bit of glow on the rocks as seen through the arch. I could do with a little more patience and should have bracketed the exposure and moved around more.
At Tent Rocks, I have many pictures of the rock formations and some very interesting surfaces, and also in the slot canyon, but the tree was the thing I was after in the shot I posted -- not much room to negotiate a shooting position. For those who can go there, it's about half-way between Albuquerque and Santa Fe, just a few miles off the interstate and (now) accessible on good roads. The park itself can be a problem during the late-summer monsoon season because of powerful water running through the canyon -- but the light is fantastic when the clouds have built up over the area.