Dim lighting with colored pencils
If the light is coming from a candle, or group of candles, you're going to have very dramatic chiaroscuro lighting.

Shadows should be very black, with not a lot of grey tones.  Keep in mind that only the elements very close to the candles are going to be visible.  Also, candles have yellow light, so basically all colors are a shade of yellow or orange.  Blues and purples will be just about black.