I started off with ambient light and then experimented with bounced flash and then fill-flash. I had decided to pick the best shots without considering the type of lighting I had used. And strangely, I picked every shot, barring one, that was shot with only ambient light. (I looked at the EXIF data only after I'd picked the shots for today's post).
Moral of the story: I still have a very long way to go before I'm able to use flash with satisfactory results.
90mm, Aperture Priority, no flash, ISO 200, 0.4s, f/9.0
90 mm, Aperture Priority, Flashed at -2 stops, external flash powered at 1/8, held above camera, IS0 200, 0.6s, f/20.0

