My tree, which we got the day before, but didn't decorate until the next day...the wait to photo it nearly killed me!

EXIF info: shutter speed priority AE mode, Tv 15, Av 8.0, evaluative metering, +1/3 EV, ISO 50, 7.2 mm focal length, no flash, tungsten WB

Processing details: I didn't do any post processing on this, other than resizing. I'm not good at all with PS, I didn't like the look of anything I tried to do, and decided that I liked this photo best just the way it is. I really like dark/light pics...I'd like to take photos that look like Caravaggio paintings. Any tips on what I could do to this photo?