Spoiler of NGE, Asuka it's purple in this draw because she is dying, in this part of the film she is fighting against a serie of evas, that's explain the face and the light. In specific I want to represent the death with palid colors (in the original draw, but a don't very good with theory color), but actually I represent that with a skin palid with the illumination of the robot. And looks so dark and green because are inside of the Eva (the robot), but have no much power. Soo.,.,., m. That!