She was done mainly by airbrushing. Her skin is Vallejo Model Air Skin Tone over Vallejo Game Air Barbarian flesh, washed with Reikland Fleshshade, then a thinned burst of VMA Skin tone followed by a thinned (and targtted) wash of Druchii violet.
Her golden pieces are are Vallejo Metalics Copper and Gold. Based with Copper, highlighted with a 50:50 mix, then a final edge highlight (with airbrush) of Gold. These paints are an absolute dream. Stop using GW metalics and get these.
Her boots and gloves are a mix of Vallejo model wash grey, nuln oil, abaddon black and incubi darkness. Her hair is the same mix but with more green (so that when she becomes the Shadow Queen the hair and snakes resemble one another).
The fabric is Screamer Pink on the outside and Khorne Red on the inside. Both washed with Nuln Oil, Druchii Violet and highlighted with the original colour and edhge highlighted with Wazzdaka red and Slannesh Grey respectively. The Slaanesh grey was the tough bit. It needed significant clean-up and a targetted wash. I learned my lesson here - use a bigger brush!
Her hair and cloth were the only bits not airbrush based and honestly I regret not doing that. It was becuase messed up the order in which I painted by starting with the metalics and then the skin - which is how I would hand brush (inside-out and all that) - but I should Have started with hair and cloth, then the metalics, then the skin.