I think this is beautifully shot and very interesting composition. But there is something that disturbs me about it. Maybe that's what you were trying to do. Perhaps there is just too much sky.
I really like this one! The subject in the lower left with the big sky works well. I wish we could get just the slightest glimpse of what the monument is standing on so we could have a better idea of its size -- whether it's 2 inches tall or hundreds of feet -- but maybe that would ruin its simplicity. Anyway, I'm rambling. What's important is this one captivated me and had me staring at my screen for a long time trying to figure it out. This one gets a solid 9.
There are things I like about your concept, but I the placement leaves me unsatisfied. I think that the colors are stunning and the lighting adds a great deal to this, but I need it to fill more of the frame.
The negative space on this one just doesn't appeal to me. I think the technical aspects are done well...I just don't find the subject and composition appealing.