Okay, I did a quick sketch:

Click image for larger version. 

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It's just a quick thing, that's why the perspective's a bit screwed, but I hope it helps anyway.
IMO the third step takes quite a bit of imagination, so you get interesting ridges, crooks and general formations.
I think the perspective bit is the tricky one. You have to keep the horizon in mind and then have the ridge facing to you go lower than the ones on the sides.

I hope I could help you a bit, be it with pointing you to the thread that helped me or with what I did here!