You may have seen some changes to the look and functionality of Artstor in recent months. They have moved to a more robust platform and unveiled a new interface. Among the many improvements is the access to information for any image or media file – no more pop-ups! 
You can also easily access Commons (open to the world) content through their separate Commons site or through the Public Collections feature. And the collection is ever-expanding – it now has nearly 2.5 million images and other media!