@Coyotemax
Super simple: Two layers, one filled with a rock texture, 80% opacity, chisel soft bevel and slight brownish outer glow, then painted into a layer mask. The other just has a bevel, 50% opacity, and then painted with a white brush, to put snow on the peaks.

@Ascension
Well, I'm fairly happy with my mountains now. Whether this is suppose to be hand-drawn or satellite map, I can't tell. My styles are clashing like titans.