I can actually think of many differences between Yuna's and Rinoa's faces. Yuna's is rounder, and Rinoa's is comparatively long. They both have wide cheekbones but Rinoa's are more jutting compared to her caved-in muzzle; Yuna has a flatter, smoother face, with a protruding muzzle (more Japanese-looking). Rinoa's mouth is smaller and more pursed, while Yuna has a (relatively) wide mouth. Yuna's eyes are almond-shaped, with one green and one blue, close together and tilted inward to appear bright and happy. Rinoa's eyes are thin and brown, spaced apart and tilted slightly away from the brow to appear sad. Rinoa's face is close-bundled together in the middle of her head, with a large forehead and spacious chin. Yuna's face is spread out, with a lot of space in between her eyes and mouth. For the life of me, I can't tell whether Yuna has a round, Japanese-looking nose or a pointed one, it seems to change from cutscene to cutscene, but the bridge of her nose is high and deep and her dorsum is sloping, and the tip is round. Rinoa's face in FMV vs. actual game is very different, but in both her dorsum is very straight and the tip of her nose is pointed -- and her bridge is so shallow! It's like the dorsum is a straight line down from her forehead! They look very different imo.