From the background it looks like ambient was killed (intentionally I assume). Looking at the exif, I'm kinda puzzled too. It says:
- Canon 1Ds MkIII
- f/8, 1/125, ISO 400, 0 EV.
If I were to take my own version of this shot, I would have allowed more ambient light, because I think the darkness in the rooms in the background seems unnatural and to me off-putting. Or with Annie's unlimited resources, I would have placed another flash in the rooms at the back to light them up. The light from the flash also looks a bit cold. Perhaps it needs a gel. I might have also placed a gold reflector in front of them and bounced a bit of flash into it to add even more sparkle and warmth to their eyes. In terms of composition, I think I would tried a very slightly lower height to decrease the negative space on top. I also think I would have picked a room with a less somber color (given the current economy). In terms of choice of equipment, I believe the leader of the free world and his family deserve a shot from a medium format camera (digital or otherwise) for posterity.