He was unfavourably influenced by the study of Italian models, and gradually gave up painting and devoted himself to the study of the history of art; his services as cicerone were especially in demand among German visitors to Rome.
He was unfavourably influenced by the study of Italian models, and gradually became estranged from painting through failures and distress. He devoted himself instead to the study of the history of art. He became a sort of ambulant antiquary, and his services as cicerone were especially in demand among German visitors to Rome.