...Hokusai himself, very old, painting under the eye of his daughter, Katsushika Oi (葛飾応為) who was also a painter, first as an apprentice to Hokusai and later with her own career while also being a producer to her father's works. The diorama is life-size and is also at the Hokusai Museum in Ryogoku.
(For a bigger version of this picture both in color and black and white, check my "Japan Arekore" set on Flickr).