single photos Have A Seat...

Back that flash up three feet and shoot it again. Also, kick it up about two feet, and angle it down some, that'll hide that the shadow on the wall by putting it on the floor.

Light the candle. [This can also help with exposure calculations.]

What is causing this vignetting effect? Is this ambient plus strobe plus HDR?

And, if that's your upholstery, I don't want to know.