I'm doing a shoot for a series of portraits tonight for a photo class of mine. All 8 of my models will be wearing the same black, long sleeve shirt and sitting in front of the same background. The background consists of an off-white wall with a tall, bright flourescent light attached to it. This gives off a nice, bright glow. My model will be sitting about a 2 feet to the left of the light. I DO NOT want a shadow cast on their faces, though. However, i would like to see all the detail of their facial features/expressions and also a nice contrast with the black shirt they're wearing. I was wondering if i should have the cieling lights on in the room as well? They dont really effect the background area, but brighten the area behind me and above where the tripod and camera are...What exposure differences would occur? So, main light on the wall alone? Light on the wall with dim cieling lights? Or any other suggestions would be greatly appreciated! Thanks!