It appears to be some pretty creative work here, but I have to say all the watermarks are killing them. You also posted your shots too large, please read our guidelines. If you are worried about people stealing your work, then post these at 850pix max as our guidelines state and you will have a lot less to worry about. Also keep in mind that we have a limit of 5 photos per thread maximum here in the Landscape Forum, your extra photo was removed.
My favorite is #1. Did you have someone helping light up the arch? I like the way it's lit up.
I agree with Stan that #4 doesn't work as well. For me, though it's not because it's been done lots, it's more the beautiful girl (your wife?) dominates the scene too much for a landscape shot. It's a wonderful silhouette of her, and done well, but perhaps more of a peoplescape than landscape if that makes sense.
and #4