Each year in celebration of Earth Day, the Gamblin oil paint company hosts a special contest. Using paint residue scraped out of their "Torit" air filtration system, they blend a limited-edition line of gray paint from the recycled pigments. Since they produce different quantities of each color every year, each year's Torrit Gray blend is different. The ultimate in recycling! Gamblin then hosts a contest challenging artists to make a painting using only Torrit Gray, black, and white. You can check out all the details here, at www.gamblincolors.com.
This is my entry, a portrait of Frans depicting his inner (contemplative) Viking.
And here's the sketch I did underneath:
Usually I don't do anywhere near as detailed an underpainting or drawing, but because the painting was to be monochromatic I wanted to work out the tonal values a bit more thoroughly first. I kind of wish I hadn't painted over it, as it was a better likeness than the painting turned out to be!