It always seems the model will jump and look at you if you begin to give directions. I think the fastest easiest way to avoid the over compensation is to stand in their vision range and hold the brush up (like how they bring in planes sort of) and put it at the angle of the head is THEN tilt the top back or toward her, or tilt left or right. Sort of guides them more subtly and there is not such a jolt from the quiet of the posing ambience,
Not to mention beginning your own painting with a small thumbnail with all the basic angles blocked in will help YOU re-orient and don't paint over it until you are done using it. Especially the distances from the edge of the nose to the face. Marking edge shapes are a great way to know you are always correcting to the same pose, not necessarily the one they sank into.
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