Update: A little step back. Now when I got the style my next move is to make the actual map. Here it is with the full mountains.

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1. I draw the mountains by hand.
2. Shade it on the right side of each individual mnt.
3. Shade it even more on the right side of the right side.
4. Shade the left side
5. Scan the mountains
6. In Photoshop, I draw a little underline under each individual mountain to enclose it, then I use the magic wand tool to select all the mountains
7. Fill a new layer with a color
8. Goes back to hand and shade the ground around the base of the mountains.
9. Scan
10. Photoshop, select the fill layer and starts to put a thin highlight on a new layer.
11. Export and Import into ArtRage Pro
12. Highlight each mountain side with Oil-Brush
13. Shade each mountain base with Oil-Brush
14. Export and Import layers to Photoshop
15. Well, now we got mountains!

I suppose there is an easier way, but this is how I do it!