This video covers all your questions about how to create detailed rock textures. Watch the creation of rock as Derek demonstrates the painting of surface textures, smooth rocks and how to create clusters of rocks in a few simple strokes!
In part one of this tutorial we block with our base colours. Initial texturing is applied to the painting as shape and form is established.
In part two we learn to break down our areas into cluster of rocks. We finish up with final detailing and light glazes/washes.