Hans Bacher has posted some photos of animation artists. Here is the link to his blog post: CREATIVE WORKSPACES 1
He said that there are more to come in the near future.
In 1981 he met Art Babbitt in the Hollywood QUARTETT film studio, where Art was animating on THE THIEF:
This one of Roy Naisbitt he took in the Soho Square studio in 1987:
On his blog there are also 2 photos of Dick W. that were taken during the production of Roger Rabbit.