A practical question about face shape labels

“Choose your face shape” is the opening instruction in a reader activity I am editing. The problem is that the oval and oblong options seem to describe much the same thing. I want to make the wording clearer without promising that every reader will fit a single category. I have bookmarked oval vs oblong face shape as a comparison reference for the revision. Should the first question describe proportions and leave the familiar shape names until later? There is space for an unsure answer and a short note about the limits of the categories. The revision should avoid presenting any outline as the best or most desirable result. An illustration might help, provided its caption explains what readers are supposed to compare. What would you change first to make this a fairer question for a general audience?