URL: https://www.researchgate.net/publication/361647537/figure/fig1/AS:11431281093755770@1667274623378/Classification-of-smile-line-smile-arc-smile-types-and-upper-lip-curvature-A-High.png
URL2: https://www.researchgate.net/figure/Classification-of-smile-line-smile-arc-smile-types-and-upper-lip-curvature-A-High_fig1_361647537
