I like the second one best. The light and swirling clouds create a deep sense of space and the stylized, almost abstract, shapes of the figures imply a story without fully explaining it yet. It makes it really intriguing like an establishing shot that's going to lead you to something interesting.
The zigzag ledge in the third pic is another good example of perspective depth. I think you could add a bit more drama by clearing the area beneath the climber so that it would look like a big potential drop.
All three pics have a nice mood to them and each achieves it in a different way.
Nice work.