Althaea ... Picart's lovely chalk drawing ... its origin and its purpose

https://en.wikipedia.org/wiki/Althaea_(mythology)

Picart's red chalk drawing probably derives from a "cartoon" created for tapestry weavers by Charles le Brun in the ?1650s?

Cartoons used for this purpose were full scale oil paintings and were rented to the manufacturers on a strict timescale so that their workers would only have enough time to weave one edition.  The rent was agreed in a complex contract and was for a substantial sum of cash, part of which was a deposit.

Le Brun's original set may have contained as many as twelve huge panels.

All that remains of the Althaea scene is a tapestry panel hanging at the chateau at Chambord.  The cartoon itself has long-since vanished.

Other cartoons, such as the one at Liverpool, are dated to 1658.

Le Brun died in 1690.

Picart's copy seems to date from 1712.

https://www.clevelandart.org/art/2008.360

The print from Picart's studio is uncertainly dated.  It is very likely from 1712 because ( in my opinion ) Picart's later prints were more assured in their technique.

https://www.rijksmuseum.nl/en/collection/RP-P-1921-566