Examples of slight adjustment due to pose. Post 2 was full face frontal,
but these next two have partial rotation of subject relative to camera lens. Note the changes between 'broad' or 'short' lighting (used for slimmer vs. fuller faces), even with subject in identical position. As they turned a bit more toward the camera, or a bit more away from the camera, the main would move around the circle...perhaps to 7:00 for more facing the lens (not illustrated), while to 8:30 for more facing away from the lens (last illustration) -- merely refinements in Main light position, yet both for 'short' lighting.
Broad
Short
Even these are generalized illustrations, as one might need to alter height or position to better suit the unique requirements of individual faces. It is this fine tuning which is why I recommend lights with constant source modeling lights, so you can instantly SEE the affects of small adjustments in position, much more easily and rapidly than if using speedlights.