Time for some more Shatterpoint.
Both the cloaks and smoke use one of my new favorite paint techniques. I put two GW contrast paints next to each other on a wet palette (say red and yellow). Then I alternate between them when loading the brush for painting. The goal is to let them loosely mix in the brush or on the model, giving interesting variations.
After its dry, more washes and highlights give more depth.
The contrast paints can also be used as a wash on the base, to give a quick-and-dirty OSL effect.