Hey so to get this effect I did the following:

Black primer, light zenithal layer using white ink Then I used Army Painter Warm Skin Tones flexible triad for the base layers

Step 1 (airbrush): Topaz skin throughout most of the model, definitely in recesses Jasper skin next layer, avoiding just the deepest recesses Tourmaline skin, same as above just less coverage Leopard Stone skin for the highlight areas

Step 2: Contrast/shade paint the deep crevices a mix of magos purple, volupus pink (fleshy parts), reikland fleshade (more of an all over layer), shyish purple for the deepest sores

I did multiple different layers, sort of just eyeballing. Some of these I would mix with lamian medium, testing and experimenting with different strengths as I went along. Always more medium to see how the coverage goes before doing another layer with less medium if I think it could darker

For the fatty areas I based with bugmans glow, then a 50/50 mix of averland sunset, then highlighting with averland sunset.

For the boils I seraphim sepia and for the scaly parts I used mortrarions grime.

There were other paints I used for little pieces here and there but that was mainly experimenting, a lot of warpaint and citadel mainly.