white under coat
50:50 mix of tentacle pink and skull white
tentacle pink shading
70:30 mix of tentacle pink and warlock purple shading
70:30 mix tentacle pink & skull white highlight
if the pink still looks too flat i add a pure skull white highlight
the purple, i dont actually have any finished examples of
but its starts with a flat coat of liche purple
70:30 liche - skull white highlight
80:20 - liche - scorched brown shading (this is a from memory mix... id suggest playing around with the additional colour and the ratio until you find something you like)
if its looking flat 50:50 skull white - liche mix as a final highlight.