Very nice work.. thanks for sharing Great idea on the black board. I can't tell you used only one light.
It's not how complicated it is, it's the results you get out of it. I'd probably rig an umbrella for shoot-through operation and use a reflector or black board as you did.
Also, a tip for 430EX users, pulling down the 14mm wide panel when working with umbrellas dramatically alters the light, it's much softer as it's now using the majority of the umbrella, at the cost of power. Then again most light modifiers cost power anyway.