If you're just looking to browse images by a certain artist/about a certain subject without much concern for specificity, you may want to use the basic search function. When you first go to Artstor, your page will look like this:
Click in the search box (outlined in red here), and type in a few words before you press Enter on your keyboard or click the magnifying glass.
In advanced searching, you are given more ability to pinpoint exactly the kinds of images you would like to see in your results. Simply click on the "Advanced Search" link below the main search box on the home page for a box to appear on your screen that looks like this:
When you run a search, your page will look like this:
On the left side of the page are a number of filters - these will be the exact same filters as were in the Advanced Search:
Getting larger thumbnails
All of the images of the results will display in front of you, defaulted to small icons. If you want to see bigger icons and get a better idea of what's in the image:
Change number of images per page
Similarly, you can also change the number of images that are displayed on a single page:
To view an image and its details from the results page, simply click on the image icon, and you'll be brought to a page that looks like this:
On the left is a large image of the item itself. When your mouse rolls over the image, there will be a little menu that appears in the top left corner that looks like this:
In the top right, there are 5 buttons:
On the right are all of the details and more information about the item (these are all labeled). Read through these for various information on who/where/what/how the image was created, where Artstor got the image, copyright information, etc. These labels will change depending on what information Artstor has for the item.
When you are looking at an image's detailed information, click on the "Cite This Item" button in the top right corner. A popup will appear on your screen that looks like this:
Click on the link "Copy to Clipboard" beneath the citation style you'd like to copy, then paste into your document!