French in his portraits and Dutch in his landscapes, rather than Italian, and he is famous for the brilliant light touch of his brushwork. George Romney also became prominent in about 1770 and was active until 1799, though with a falling-off in his last years. His portraits are mostly characterful but flattering images of dignified society figures, but he developed an obsession with the flighty young Emma Hamilton from 1781, painting her about sixty times in more extravagant poses. His work was especially sought-after by American collectors in the early 20th century and many are now in American museums. By the end of the period this generation had been succeeded by younger portraitists including John Hoppner, Sir William Beechey and the young Gilbert Stuart, who only realized his mature style after he returned to America. The Welsh painter Richard Wilson returned to London from seven years in Italy in 1757, and over the next two decades developed a "sublime" landscape style adapting the Franco-Italian tradition of Claude and Gaspard Dughet to British subjects. Though much admired, like those of Gainsborough his landscapes were hard to sell, and he sometimes resorted, as Reynolds complained, to the common strategem of turning them into history paintings by adding a few small figures, which doubled their price to about £80. He continued to paint scenes set in Italy, as well as England and Wales, and his death in 1782 came just as large numbers of artists began to travel to Wales, and later the Lake District and Scotland in search of mountainous views, both for oil paintings and watercolours which were now starting their long period of popularity in Britain, both with professionals and amateurs. Paul Sandby, Francis Towne, John Warwick Smith, and John Robert Cozens were among the leading specialist painters and the clergyman and amateur artist William Gilpin was an important writer who stimulated the popularity of amateur painting of the picturesque, while the works of Alexander Cozens recommended forming random ink blots into landscape compositions—even Constable tried this technique. History painting in the grand manner continued to be the most prestigious form of art, though not the easiest to sell, and Reynolds made several attempts at it, as unsuccessful as Hogarth's. The unheroic nature of modern dress was seen as a major obstacle in the depiction of contemporary scenes, and the Scottish gentleman-artist and art dealer Gavin Hamilton preferred classical scenes