What is the fine-grained topic of the following text: In 1854-1859 he made several trips to Italy, some of the time visiting relatives, studying the Old Masters; he painted historical pictures and realistic portraits of his relatives: Portrait of Marguerite de Gas, the Artist's Sister, Portrait of Achille de Gas in the Uniform of a Cadet, Portrait of Hilaire de Gas, Grandfather of the Artist. Only return the topic.
The artist's trips to Italy and creation of family portraits