Well first are you going to do your mountain in Eastern U.S. scenery or since I see your from Colorado is it going to be more of a desert theme ?
First thing I'd do is take out all that track you have there man your gonna to have a mess to clean up and you have a good way to go before you need track.
The last step for scenery like yours is track and ballast
I'd also ditch the air brush idea and use a rattle can to put down a different color base.Valspar makes a paint Called Valspar Stone .It's a grey textured paint that simulates granite .The color I use is called Manhattan Mist and you can get it at Lowes .
Once it's dry you can hot glue your rock out croppings and brush them with some watered down grey acrylics .Like Jim said foliage is your friend and you'll probably cover alot of the mountain with it any way.
David
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