How to Paint Moss and Rocks

I USE A TABLET
I don't know if this will be possible without it so I'm disclaiming now before anything happens. O.o
I'm sure that if you tried you could do this without a mouse but I have no idea.

Anyway...
This is just a simple tutorial that I created because someone asked me how I draw rocks and nature things.
It's a bit bland maybe.. but it gets the idea across I hope. O_O