脸如死灰: one's face is like a death mask.; one's face turns ashen [ashy pale].; one's face turns the colour of ashes.; one's face is the colour of wood ash
面如死灰: the face turned ashy.; a white and bloodless complexion; as pale as dying embers; be (as) white as a sheet [as ashes; as death]; one's face was as white as a sheet.; (he) went as white as