Iconography
There are many perceptions about the iconographic transformations of the Prometheus figure to be found in Olga Raggio, "The Myth of Prometheus: Its Survival and Metamorphoses up to the Eighteenth Century", Journal of the Warburg and Courtauld Institutes 21.1/2 (January - June 1958):44-62, available through JSTOR. Working them into this article will improve it.