Regters, Tibout – Jan ten Compe (1713-61). Schilder en kunsthandelaar te Amsterdam, 1751 Rijksmuseum: part 1

The picture has something of this: people, portrait, man, Renaissance, instrument, sword, wear, indoors, weapon, museum, scientist, woman, two, war, knight.
Perhaps it’s a painting of a man sitting in front of a easel holding a paintbrush and an easel with a picture of a building in the background.