When rendering a face shot switch your camera to the "Face Camera", when doing a body pose switch to the "Posing Camera".   I used to use the posing camera to zoom into the face but the render doesn't look as good since the settings on the face camera are made to bring out the face. You could of course manually adjust the camera settings for the pose camera but to keep it simple just switch to the face camera when doing face renders.

i'm sure there are ways to expand on this basic concept.