Here’s a tip I was taught by an old news photographer when I first got my start in the business. When you’re shooting bounce flash and need to fill the light in people’s eyes so there’s no dark sockets there, a great technique to use is “two fingers” fill light. Simply hold your off-camera strobe (see tip on off-camera corded flash) in your left hand and extend two fingers over the top of the flash . Angle these fingers at 45 degrees toward your subject and shoot a test. Voila! Perfect, warm fill light on your subjects’ faces! Not only will you get nice fill light but your skin will add warmth to the color of the strobe light.
Go ahead and try this: shoot a bounce flash exposure straight up against an 8 ft. ceiling. You’ll see the darkened eye sockets that are so unflattering (below left) and the blown-out light on the cheeks of your subject. Now simply add the “two fingers” technique describe above. (See below right)
Ta-dah!! Quite a difference!