Sothis is a girl of around 15 or 16. She dresses with practical stylishness in clothes which are plain but expensively cut, and which show off her lithe, supple frame to its best advantage. She has a small mouth with rosebud lips, and large green eyes, in a pale, oval face framed by a cascade of waist-length golden curls.
It is when you meet those eyes that the china-doll impression of youth and vulnerability falters; the determined gaze seems to belong to someone much older. All in all you are reminded of a line from the Lancre Play: "Look like the innocent flower, but be the serpent under it."