This is the cute jungle paintings Rousseau, not the liberty-equality-fraternity one. (that is Jean-Jacques)
Henri's art went in and out of fashion so he had a lot of gig work under his belt, including as a tax collector
If you've done walking tours in Paris you might have been shown old entries and gates where goods were taxed on their way into the city -- Henri was posted at one of them.
https://en.wikipedia.org/wiki/Octroi