Faces should be exposed from 60%-80%. Use the Af-100 Zebras set to 85% and make sure no stripes appear on the face, then they should be fine.
For the dress, set the Zebras to 100% and make sure no stripes appear on the dress. This may under-expose the faces a bit, but they can be recovered in post with some color correction.
If you over-expose, its gone; if you under-expose you have a small margin to bring it back.
Bars & Tone
SALUTE!