there's hardly ever been a time where a UV projection with no per-point adjustment has been adequate. and with something like a face, I can tell you that it will 100% always require per-point adjustments. It's simply a matter of patience, and understanding the shape of your model. Some things may require their own UV space... the inside of the mouth, the backside of the ear, for examples, since these parts of the face are so overlapped with the rest of the geometry, it's difficult or impossible sometimes to keep them with the main head UV shell.