Wizards - Magicians - Sorcerers - Alchemists

Michael Maier - Hermes Trismegistus, from Symbola Aureae Mensae

Hermits, monks and mystics. Ink drawings on paper.

Athanasius Kircher - Amulet of Venus and Mars, “Oedipus Aegyptiacus”, 1652.

Heinrich Cornelius Agrippa’s Demon Seals, originally drafted in the early 16th century (modern English translation and interpretation by Lupus Nensén).

Arthur Edward Waite - The Double Seal and the Pentagram of Solomon, “The Mysteries Of The Goetic Theurgy According To The Lesser Key Of Solomon The King”, 1891.

Ancient Glyphs.

– John Buscema

Michael Maier - De Circulo Physico Quadrato, 1616.

Only info I can find at the moment is from this etsy link

Used on the cover of Wizardry and Wild Romance by Michael Moorcock, on a White Dwarf cover, a German magazine cover and a French paperback.

Way Shower by Gilbert Williams

Diagram showing a Key to Alchemical Magnum Opus.

Inscribing runes in a mysterious tome (By Paulo, from "More Thrills from New Skills" by Mark Hendley, expanding upon AD&D's rules for non-weapon proficiencies, Australian Realms 4, October 1988)

John H. Tice - Sun (detail), “Elements of Meteorology”, 1875. 

Sigillum, “Praxis Caballe Albe et Nigre Doctor Johanni Faustii”, 1825.

Livre de la Vigne nostre Seigneur; France, 15th century; Bodleian Library, MS. Douce 134, f. 49v

Wizard at work (Patrick Jenkins, Different Worlds 14, Chaosium, September 1981)