It's an airbrush job: white undercoat preshaded with VMC chocolate brown, filtered with kommando khaki and brought up to VMC ivory, in about 4 mixes.
It'd have been quicker to lay down a deneb stone base coat, shade down with a little VMC leather brown, and lighten with the ivory, which is what I did when the mask peeled for one of the stripes.
Excellent. Beautiful choice of colour scheme (FW book inspired maybe?) and well executed. I like especially that you avoided the stereotypical yellowy bone on most Deathwing models. I'm intrigued what colours you used and the methods of
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