This painting by the German Heinrich Buchholz (1735–1780) dates from approximately 1770 and depicts Tsar Peter the Great (1672–1725). It is a study for the great portrait produced by Buchholz in 1770 for the Peterhof Palace, the tsar's summer residence in St Petersburg.
Heinrich Buchholz (1735–1780), Portrait of Emperor Peter the Great (1672–1725), oil on canvas, ca. 1770; source: The image is used from www.hermitagemuseum.org, courtesy of The State Hermitage Museum, St. Petersburg, Russia, https://www.hermitagemuseum.org/wps/portal/hermitage/digital-collection/01.+paintings/337634.