A challenge within a challenge! I've often admired fantasy art rendered in sepia tones. It reminds me of Tolkien and the Brothers Grimm and evokes an atmosphere of a timeworn, bygone era. The detail fantasy artists accomplish with tone and shading is remarkable.
I have never painted anything in sepia, nothing even remotely monotone. Most everything I do is full of vibrant color. So today, after watching an interview with two fantasy artists, I decided to try my hand at using only one color. I'm not quite sure I achieved my initial goal, as he was intended to be a troll and seems to me to be more wizard-like, but I am happy with the outcome. Maybe someday I'll challenge myself to 100 days of fantasy art.