Zorn Palette
This was done using the Zorn Palette, named after the Swedish painter Anders Zorn. It's a limited palette of ivory black, white, vermillion (or cadmium red light, but I used vermillion), and yellow ochre. Many colours can be achieved just through these four,such as mixing black and yellow ochre to make green, and so on.
Comments
As always this is very nice work. Jack's a tough nut to crack, and you've cracked him... the sketch was cool but this is the business!