Preparstory steps

1. glue rocks in various sizes to the base
2. cover in texture paint of choice such as Stirland Mud
3. prime Mechanicus Standard Grey

Base colours - Ground

1. Dryad Bark

Drybrush - Ground

1. Gorthor Brown
2. Baneblade Brown

Base Colours - Rocks

1. Mechanicus Standard Grey

Wash - Rocks

1. Agrax Earthshade
2. Drybrush - Rocks
3. Deep Grey
4. Uniform Grey
5. Ash Grey

Drybrush - everything

1. Screaming Skull