If you're talking just the face, Yossi. The only fault I find in her is her unaligned teeth. Her face also tends to puff up easily which is....bad. I may be biased, but I can tell you I like her because of her beauty, and not because she's cute, funny, sexy and all other stuff.
Honorable mentions: Ayaya, Takahashi.
Others I find good looking: Eri, Sayu, Kaori, Nacchi.