Johann Ernst HeinsiusJohann Ernst Heinsius "Johann Ernst Heinsius (German: [ˈjoːhan ʔɛʁnst ˈhaɪnzi̯ʊs]; 21 May 1731, Ilmenau - 18 October 1794, Erfurt) was a German portrait painter and miniaturist." - (en.wikipedia.org 10.08.2021)