Step one: basecoat areas that will be white with thinned GW Dheneb Stone
Wash all the new basecoat with a slightly thinned Agrax Earthshade
Drybrush areas with Dheneb Stone
Drybrush with Skull White
Basecoat the cloaks with Liche Purple
Layer with Warlock Purple.
The next step will to wash the cloaks with Leviathan Purple Ink and start working on the metal and other purple borders.