As Kaz said, painting is usually the way to go..I probably should have described it that way, my apologies. Anyway here is a quick
example...I didn't get into too many details or fine tuning, I just wanted to show you the very basics of how I usually start terrain.
After this point it is a lot of fine tuning. I think the main concept is to get the ideas, shapes, and shading down and then fine tune
the lines and details for that sharp look. Not everyone, but a lot of us that focus too much on the lines first end up having
our terrain look very unnatural.
Please pardon my disregard for all that is holy and sacred in art, had to do this in a rush.