I have a shoot coming up with a model who has red hair and very light skin. My challenge in the past has been trying to keep the face details and shadows without underexposing the rest of the features and clothes. I've moved back the strobes and lowered their power, but that just darkens everything else. Natural light is not an option with this shoot. I use a flash meter and have bracketed my shots. My normal film is Acros 100 using a Mamiya 645e. Any suggestions? Thanks!