You have a few options to search or browse Artstor.
1. Once you're in Artstor, look at the middle of the screen, you'll find a search box. You could search for a topic, artist, country, type of art work, or even themes.
2. You could click on Browse, which will give you options to look at different types of art work or where the art work is from.
The results page will be small thumbnail images of the artworks
To enlarge the image, just double click on the thumbnail.
Once you have the image up, the information is to the right of the image. Click on Generate Citation to copy and paste a citation into Noodlebib or your paper.