Try drawing a cliff, just one side, and let your skill evolve a bit. Just doodle for a while until you get it right. Then try drawing a cliff viewed from the back (so you don't see the wall, just the ridge). That's gonna be hard to get the right feel through to your viewers. But once you get THAT right, you can just draw the first one behind it (on a separate layer maybe), and erase the bits that should be hidden by the closer ridge.