The following is exerpted from the ARTstor Help wiki:
Begin an Advanced Search from any location in ARTstor:
On the front page of the Digital Library, click advanced search beneath the Keyword Search box in the upper left corner.
On a search results page, click Advanced search beneath the Keyword Search box in the upper right corner. You may also click the Advanced Search button.
Go to the ARTstor navigation menu and click Find > Advanced search.
In this interface, you can narrow your search to a specific
collection, object classification or geographic area (continents and
countries). Use CTRL + click while clicking in a list to make multiple
selections (maximum of 5).
You can narrow your search by date or a date range.
Using the drop-down menus in the top left of the Advanced Search interface, you can search for terms in any field of the object record, or exclusively in the title or creator field. Choose Boolean operators (And, Or, Not) from the drop-down menus to the left of the search boxes.
You can enter multiple words in each search box. As in the Basic Search, AND is the default Boolean operator.
Searching Notes and Comments:
If you have added notes or commentary to image records that you have saved, it is possible to search the text of these notes by doing the following:
N.B. It takes a few hours for new note entries to appear in the search results.
More on searching ARTstor (from the ARTstor Help wiki)