I was drawing a few mountains to practice and I figured I would share a bit of the process here:

The steps:
1. Moutains main outlines on some texture
2. Adding Ridges
3. Adding detail ridges
4. Painting light shadows
5. Going deeper in shadows
6. Painting highlights
7. More highlights
8. A very slight touch of grey/brown and green colors.

Click image for larger version. 

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