This has always been fascinating to me: The relationship between Disney layouts and final backgrounds. It is interesting to see what the background painter changed from working with the layout. For example, the layout above from The Jungle Book suggests a dark, cloudy sky, a storm might be approaching. The BG shows sunlight, mid day.
Comparing the two, I would say that I prefer the dark foreground level of vines and branches in the layout. The highlights in the final painting compromise the depth of field.
I wonder how much Disney's layout and background artists used to argue over color, contrast, light etc.