s13e10 Winding Mountain River

i have a brush shaped like a "7" with a high jitter.  dragging it creates a solid edge down the leg of the 7 and the bridge across the top of the "7" breaks a lot into horizontal blocks... angle as necessary to produce diffrerent grades; invert the angle on eraser to create choppy breaks.   
start with a base color; have a highlight and a shadow color to layer for added texture.
This was a pretty early effort.  Here's other pieces with a similar technique:

   

I'll be starting up some painting on twitch soon.  follow and I'll shout when they're up and running.