William Cosmo Monkhouse,
Dictionary of National Biography…
(1887)
“ He was the first water-colour painter who sketched in Italy and the Alps, and he attained a skill in the rendering of atmosphere which had never been attained by any previous painter in water-colour. His drawings are little more than tinted monochromes, but they are delightful in tone, and his colour, though slight, is harmonious and suggestive. No one before had approached so near to nature with such slender materials, and in drawing and composition he was a master. ”
