Reverse Google Image Search allows you to search in Google using the image file itself rather than doing a keyword search. This is useful for pinpointing images that are the same or similar to the image your are looking for. Simply go to https://images.google.com/ and drag and drop your image file into the search box.
Artstor offers more than one million digital images in the arts, architecture, humanities, and sciences with a suite of tools for doing research. Images in Artstor are high quality images for download, with complete descriptive information related to the image itself, and the object(s) depicted.
Advanced Search: Allows you to search by architect, image creator, and project, and further limit your search by location, classification (architecture, decorative arts, drawing, etc.), by date, or search within institutional collections like Columbia University Image Bank, or all of Artstor.
Results: You can further refine your search results in the result page.
Image View: Offers you all the the rights information you need to make a full citation, and also offers other important information you might not find elsewhere. You can also download high resolution images directly from this page.