“The entry of Emperor Francis I and Joseph II into Frankfurt for his coronation in 1764.” After 1764. Swedish/Austrian. Oil on canvas. Martin van Meytens and workshop, artists. Collections of the Kunsthistorisches Museum, Vienna. In the public domain in the United States because the artist died over 100 years ago. via https://commons.wikimedia.org/wiki/File:Martin_van_Meytens_011.jpg

“Die Erstverleihung des Maria-Theresien-Ordens 1758.” ca. 1758. Swedish/Austrian. Oil painting. Collections of the Schloß Schönbrunn. In the public domain in the United States because the artist died over 100 years ago. via https://commons.wikimedia.org/wiki/File:Martin_van_Meytens_014.jpg

Franz Stephen and Maria Theresa with their children. 1764-1765. Swedish/Austrian. Collections of the Kunsthistorisches Museum, Vienna. In the public domain in the United States because the artist died over 100 years ago. via https://commons.wikimedia.org/wiki/File:Martin_van_Meytens_010.jpg

Thinking the smallest daughter, the fourth one over from the left from Franz Stephen, is the future Marie Antoinette, the Archduchess Maria Antonia.