Amethyst Compote with Lid.
I've tried something rather unusual. . . I set this up with a candle in it and no direct lighting. I placed plain paper behind it to see the candlelight reflections and painted it pretty much "in the dark." Occasionally I turned on a light to see exactly where the brush was going. (I did have a small lamp on in the room, so I wasn't totally in the dark) I think it produced a rather interesting effect!