Once I feel the shapes are modeled right and it has the feel that I want I went in and covered the background in Ivory black. The mediums I used was Linseed Oil and Dammar Varnish, which I will next time just use a little of Linseed instead of using both Dammar and Linseed.
When the background is done I went in and started playing with colors on the portrait, which is the fun part.
I used very little Linseed Oil and primarily did this in two sessions. Hope you enjoyed!