Scheme Reference
The machines of Beta Galaxy are painted a sandy tan on the upper half and dark gray on the lower half.
Camo Specs Online
Artist Notes
For the tan upper body, I started with a coat of Zandri Dust. Then I washed it with Agrax Earthshade. After the wash, I re-layered the panels with Zandri Dust and then added highlights with Morghast Bone.
For the grey legs, I started with Mechanicus Standard Grey. The wash was Nuln Oil. Then I re-layered the panels with Mechanicus Standard Grey and added highlights with Administratum Grey.
All of those paints are from the Citadel Colour line.