Круг Таро, Рейки и Магии

For a sketchbook assignment, I have to compare facial outlines and explain the labels I choose. The distinction between oval and oblong is where I keep hesitating, especially with simplified drawings. I want the notes to describe what is visible rather than suggest that one shape is preferable. I have oval face shape on my reading list for the terminology. Would you begin with overall proportions and then add notes about where the outline is widest? There is room for a few guide marks, though I do not want them to overwhelm the sketch. I would still describe the forehead and jaw individually, even when the overall category seems clear. A sketch with clear explanatory notes would be more helpful to me than a famous face comparison. The assignment asks for a reasoned description, so simply writing a category name will not be enough. How do you keep the description useful when the sketch does not fit one category neatly?