Just a little help to learn a simple mountain painting:
Step 1: Paint the fill of the mountain. Just to know it's shape. Step 2: Put the lightest part with another color. It will show, from which part will the light come. Step 3: Draw the most important outlines and some cracks. It's up on you how much would you like... ( lines should be 4pt and 2 pt weight ) Step 4: Put some darker shadings on the darker parts. ( use the layer on 15% opacity ) Step 5: Put another layer with a darker shading on the darkest parts ( also on 15% opacity with the same color ) Step 6: Put the lightest parts with white color on 30% opacity. Step 7: Final step... Put a little contrast with the Curves menu. It will look more real.
I just learned and I wanted to share with others too... I hope it will be helpful