[bào tóu huán yǎn]   

豹    头    环    眼    形容人的面目威严凶狠。 贬义>

豹头环眼bào tóu huán yǎn，脑袋像豹子的头一样大，眼睛像环形，形容人长得面相威武或威武凶狠。

One's head was shaped like a leopard's, his eyes round

豹头环眼    豹死留皮