Though he never traveled to Italy, he became proficient in making small Italianate landscapes and genre pieces in the manner of Pieter van Laer.
[3] Graat was known for his skill painting farm animals, and taught the painter Johann Heinrich Roos, whom he outlived.
[8] Graat lived to the great age of 81 and was active as a decorative painter, creating Grisailles and overmantel pieces for the regent families of Amsterdam, many of which survive today.
[1] His nephew Matthijs Pool who married his daughter in 1708 engraved drawings that Graat made of ivory sculptures by Francis de Bossuit and published these in 1727.
[1] The Amsterdams Historisch Museum has an Allegory of Care painting in their collection from the former Old Men's Almshouse, based on an emblem by Cesare Ripa.