I am preparing a short article on Sir Edward Burne-Jones' Perseus Cycle, specifically the final painting, 'The Baleful Head.' It is crucial that I ascertain the identity of the woman whose likeness was used for Andromeda (see image, above). I suspect it to be Julia Stephen or Maria Zambaco.
Maybe this is Margaret Benson? Margaret was a model that Edward Burne-Jones had seen, and was introduced to at the Albert hall, around time of preparation for this painting.