My camera has a "spot metering" feature, where I could focus on the face and meter the shot exactly on that small area of the image. I chose my camera specifically because it had this feature.
Check and see if your camera has this capability and how to use it. It will give you perfectly exposed faces every time.
Then you can turn spot metering off and shoot the image again to get an average exposure for all the rest of the stuff in the photo.
And, assuming you have a digital camera, you can always check what your photos look like before you leave the photo shoot. I give the subect a few minutes to rest while I take some time to look and see that I have several properly exposed face shots to choose from before I tell the subject we're done.
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