Materials: oil on canvas. Dimensions: 100 x 82 cm. Source: http://www.bbc.co.uk/arts/yourpaintings/paintings/a-waterfall-219818. P.S. I have changed the light, contrast and colors of the original photo.
Materials: oil on canvas. Dimensions: 126 x 187.5 cm. Acquired in 1957 by H.M. Treasury and then transfered to the National Trust. Source: http://www.flickr.com/photos/20744067@N00/6261510264/sizes/l/in/photostream/