I've always liked your cliffsides but this makes them really interesting. It's almost a tie in my mind between how cool both of them are. As for the trees I like the new look trees. Maybe you can try keeping the old cliffsides and just washing out the trees?
Please stick to the pencils. Your choice of course but the computer colored one looks like a weather map.
I like your pencils. I do like the way the computer swirled the colors a little more than you are probably able to do in the trees and water, made it looked pretty neat but other than that, your pencils are far superior.
Overlay the pencils on the paint.net version so that you still have contrast and detail.
I'm liking this touch - perhaps to be added sparsely in certain contexts - but overall I prefer the pencils. That said, you should create what you want/like to!-=A
The pencilled one looks sharper and better.