Uppink, Willem – Portret van een schilder, vermoedelijk de kunstenaar zelf, 1788 Rijksmuseum: part 3

The picture has something of this: people, portrait, man, pants, jacket, outerwear, wear, lid, facial hair, coat, mustache, furniture, easel, writer, necklace, scarf.
Perhaps it’s a painting of a man sitting in a chair holding a paintbrush and an easel in his right hand and a palette in his left hand.