The last time I posted about the ravine scenery the rocks were all still plain white plaster. I painted these using the woodland scenic 'leopard spot' technique. Except, I just use cheap acrylic earth tone paints instead of the Woodland Scenics colours. I make up thin washes of each colour and spot them around, making sure to leave sufficient patches of plain plaster. Then this is all tied together with a wash of the colour that you want to use as your dominant colour. For this I used a black wash, yielding a dark grey colour. If any colours appear too intense I hit it with some wet water from a spray bottle.
These photos show the rock faces while they are still a bit damp. Once they are completely dry I'll dry brush the faces to bring out the highlights and help blend the different colours together.