That's pretty damn good. The use of light around the guy with the whip works awesomely well. The texture of the zombies, but just of the air in thes scene, really captures the emotion and lack of love in the room. Nice.
Of course, techniques like this are actually used. Not literal 'zombies', but the slaveowners use drugs to keep the 'slaves' in line... it's called 'zombie' because they administer a drug that makes the captive appear dead, then unbury and kidnap them.