Waterfall art. Flemish. Simon-Joseph-Alexandre Clément Denis, artist (1755-1813).

Cascatelle,” Undated. Oil on paper laid on canvas. Attributed to Simon-Joseph-Alexandre Clément Denis. Image ©2020 Artnet Worldwide Corporation.  Fair use license. via http://www.artnet.com/artists/simon-joseph-alexandre-cl%C3%A9ment-denis/cascatelle-AEXAQCD1NyaTTn-Rc1D17w2
“A View to the Cascades of Tivoli,” which depicts Franch artist Elisabeth Vigee Lebrun and her 14 year old daughter sitting under a tree and sketching the cascades. 1790. Flemish. Oil on panel. Signed “S. Denis,” inscribed and dated on the lower right. Image © 2002-2020 LiveAuctioneers. Fair use license. via https://www.liveauctioneers.com/item/89625718_simon-joseph-alexandre-clement-denis-flemish
“View of the Cascades at Tivoli.” Undated. Flemish. Private collection. Image © Web Gallery of Art. Fair use license. via https://www.wga.hu/html_m/d/denis/tivoli1.html