You're newest edit is definitely a step in the right direction. Right now, I think your biggest problem is the the mountains are too triangular. Take a look at Tim's edit. the mountains in the back are not triangular, they go up in more of a trapezoid shape and are flat with multiple peaks. Use a reference if you haven't, I think it would help out a lot. I think this could be useful to you

but there are probably better ones out there, I only looked for a minute or so. Personally I would avoid using the spikes on the mountain just because they would be distracting in game.
I edited the front two mountains, but it's probably not worth much because you have other edits that would demonstrate it better.

I don't know why it's AA'd like that photobucket is messed it up or something..