This assignment was to paint a portrait in black and white and glaze it with color after it dried. Matthias says this is how the old masters would paint because it was cheaper than painting with color and pigments were real expensive those days.
I picked a portrait of this MMA fighter (not really sure about his name) because of the bruises and sweat on his face. When adding the color I decided to super-exaggerate the colors of the bruises to give it a more fantasy look.
BriskArt 
Great picture, I like your use of colour and light and the personality captured. You’ve done well with the foreshortening too.
http://literarylydi.wordpress.com
It’s funny with portraits I make up personalities for the subjects. This guy I kept thinking he was a guy that liked to get punched in the face for a living. Like he had no other job skills so he would wander around at fairs and parties asking people to punch him in the face, for like five bucks. That is where the personality comes from.