On his return to London he settled in
Berners Street, and soon assumed the position of the most fashionable portrait-painter of the day. Nearly every fashionable beauty sat to him. His portraits were chiefly life-sized, boldly executed but graceful crayon drawings, although many of them were completed subsequently in oils, and frequently at full-length. A large portrait group of the three beautiful Sheridan Sisters, the Countess of Dufferin, the
Hon. Mrs. Norton, and the
Duchess of Somerset, which remained in the possession of the
Marquis of Dufferin and Ava at least until 1885. Swinton also drew and painted the portraits of eminent men with great success, among them being
Louis Napoleon (afterwards Napoleon III),
Lord Stratford de Redcliffe, the
Duke of Argyll,
Lord Canning,
Bishop (afterwards Archbishop) Tait (painted in 1860{{cite web |url=https://www.britishmuseum.org/research/search_the_collection_database/search_object_details.aspx?objectid=3223456&partid=1&output=People%2f!!%2fOR%2f!!%2f74433%2f!%2f74433-1-6%2f!%2fPortrait+of+Archibald+Campbell+Tait%2c+Archbishop+of+Canterbury%2f!%2f%2f!!%2f%2f!!!%2f&orig=%2fresearch%2fsearch_the_collection_database%2fadvanced_search.aspx¤tPage=1&numpages=10 Swinton exhibited for the first time at the
Royal Academy in 1844, and his portraits were familiar objects there for thirty years. Swinton was dependent on the vagaries of fashion for his vogue as a portrait-painter, and his portraits quickly lost their repute, although they will always retain their value as historical memorials. ==Later life==