This page outlines how you can use Artstor images in papers, including:
If you are looking to use an image you find in Artstor in a publication (a book, scholarly journal article, or thesis/dissertation that will be posted on the open web or otherwise published), you must contact the image owner. It is important to note that Artstor does not own the images in the Digital Library; they are owned by the institutions who graciously contribute them to our database. Contact information is located in the “rights” field in the image’s metadata. In rare instances when the rights field does not provide traceable contact information, please reach out to us at support@artstor.org and we will assist you in finding the image owner.
To include an image from Artstor in a paper, first you must download it. In order to download an image from Artstor you need a registered account.