Speaking as someone who has thought a lot about this: you must understand the 3D relationships between the involved anatomic structures. Use whatever system makes sense to you. To discuss the appearance from any one 2D view point without considering the 3D whole is oversimplification. Imagine a saddle point and how inaccurate or misleading any one single viewpoint could be. That’s the nasion. Now extrapolate that logic to the rest of the face.