Here are some wonderful pieces from The Jungle Book that were recently sold at auction.
The piece above is a cel set up (matching cel with painted background). I don't know who painted this background, but the animation is by Milt Kahl. What I particularly like about the painting is the fact that some dark line work was maintained to match the characters' outlines.
I would call this a quintessential scene from the movie.
Below are a couple of concept paintings by Art Riley, who was one of Disney's great background painters. Google him and you'll find tons of his personal watercolors.