見澄ます[misumasu] to observe carefully
耳を澄ます[mimiwosumasu] to listen carefully
上澄[uwazumi] the clear top of a liquid
澄まし屋[sumashiya] a prim person
澄まし顔[sumashigao] composed expression

澄ます[sumasu] to clear
澄みきる[sumikiru] to be serene
澄み渡る[sumiwataru] to be perfectly clear
澄む[sumu] to clear (e.g. weather)
清澄[seichou] clear

雲鬢花顔[unbinkagan] beautiful woman (metaphorical)
横顔[yokogao] face in profile
温顔[ongan] kindly face
なに食わぬ顔[nanikuwanukao] innocent look
我物顔[wagamonogao] looking or acting as if one owned the place

汗顔[kangan] ashamed
顔から火が出る[kaokarahigaderu] to be extremely embarrassed
顔を顰める[kaowoshikameru] to grimace
顔を潰す[kaowotsubusu] to make somebody lose face