Hi!
I've just uploaded in the post below a new step-by-step tutorial about painting Asmodai's robe.
As you can see it has a delicate and smooth color transitions which create an illusion of a soft fabric, and that was all painted with a brush and Pro Acryl paints.
On the first page of the tutorial you can find a list of the colors that I used and they Vallejo alternatives.
I hope you like how it looks!
Regards
Flameon