8x14" Gouache on Cold-pressed Watercolour paper
Master Copy from Miyazaki's Princess Mononoke:

Colours based on a screenshot in the movie (I missed that mark by a mile):

Drawing and value scale based on the unmodified version (concept art?) of the above image:

Process:
EDIT 03/20/10: The foreground values of the grass annoyed me to no end. Fixed.
EDIT 03/24/10: Clouds were a little blocky. Fixed, though the rendering still doesn't come close to the original.