恍惚[koukotsu] ecstasy
恍ける[tobokeru] to play dumb
恍け[toboke] assumed innocence
恍惚状態[koukotsujoutai] state of ecstasy (rapture)

恍然[kouzen] fascinated and distracted by something
恍け顔[tobokegao] a face of (feigned) innocence
御恍け[otoboke] feigned ignorance

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