So here were are based in a nice orange/yellow, with a paler yellow picking out some details.
Then a messy wash of Burnt Umber/Raw Umber to fill in all the deeper areas and show the detail. I've left it at that as, hey, they're Orks right? And a right messy bunch.
Next shot is with the blacks put in and decals put on.
Last shot, the pilot and cabin all done.