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Though not registered as a pupil of Rembrandt, he made a copy of a painting by Rembrandt that he saw presumably in Amsterdam while he trained there from 1647 to 1653:
Roos specialized in pastoral idylls, idealized landscapes with ancient ruins. He found inspiration in engravings. These pastoral scenes represent the longing of Roos for harmony between men and animals with nature. Among biblical, historical and genre scenes, Roos preferred subjects involving animals: the shepherds of the nativity, Venus and Adonis.
Roos was also one of the finest Germanportrait painters of his time. He painted princes, noble ladies and officers, but also Frankfurt middle classes.
Roos worked too from many individual drawings (Albertina, Vienna), mostly of domestic animals. He intensified the individuality of each species.
His sons Philipp Peter Roos (Rosa di Tivoli) and Johann Melchior Roos were also renowned painters. Their works are represented in museums at Frankfurt, Cologne, Dessau, Darmstadt and Stuttgart.[3]
