Thank you. For the blue parts of the robe I used the mixture of W&N Thalo (red shade) + Schmincke Prussian blue.
Since those two paints would make (too) high chroma tints, I neutralized the mixture a bit with W&N Payne's gray and grey made with Schmincke Mars Black + Flake.
I added Mars black in the Thalo/Prussian blue mixture for the darkest parts of the robe, as well.
It's a very impressive strong portrait Valentino. Conratulations for it! I've seen your work before and think I'd recognize it anywhere. I like the unique way you seem to simplify the images.