Cornet also painted and drew portraits, landscapes, interiors and a range of other subjects.
He served as head of the Prentenkabinet (cabinet of prints) in Leiden from 1851 to his death in 1882.
After his death, no successor was appointed, and large portions of the collection were transferred to the Rijksprentenkabinet, now part of the Rijksmuseum in Amsterdam.
[4] A Cornet painting dating to about 1845, now in the collection of the Lakenhal museum, depicts the 17th-Century painter Paulus Potter.
The Rijksmuseum in Amsterdam has an 1848 portrait by Cornet of the painter David Pierre Giottino Humbert de Superville.