The Missing PL-ink
The episode in Milton's Paradise Lost when Satan enters the Serpent, just before tempting Eve, has been very rarely drawn by artists. Two of them, well, should be well-known to you: see Terrance Lindall's version, and dhr's.
The picture above is taken from one of most beautiful Medieval books ever: the Rupertsberg Code, of the late 12th century, containing the collection of revelations called Scivias by St Hildegard of Bingen. The black smoke mass, recalling a burnt tree or a hand, represents Satan, while the horizontal red 'pipe' is the serpent's body, or rather 'soul,' being invaded by the devil. Eve is shown as a cloud filled with stars.
The only existing edition of Scivias in Italian - published by the Vatican (Libreria Editrice Vaticana, 2002) - is unfortunately not very good: the translation would need some editing, and, above all, a great part of the contents have been quickly summarized or completely skipped. But, at least, its wonderful miniatures can be enjoyed. And a personal, modern remake of them will be soon posted on this website. Stay tuned!