This post on BibliOdyssey has some great insect and spider illustrations by August Johann Rösel von Rosenhof
"August Johann Rösel von Rosenhof (1705-1759) was a German descendent of Austrian nobility and showed an early aptitude for painting. Following an apprenticeship with his artist-uncle and further study at the Academy of Nuremberg, Rösel obtained an appointment at the royal court in Copenhagen painting portraits and miniatures."
Here are a couple of my own spider portraits from my To Know the Spiders project: