You might try Oxford Art Online for images.
Next, take a look at ARTstor, searching under the name of the creator and/or the name of the work. You'll need to register to download images. If you want, you can save details of the images too!
Finally, you can broaden your search by searching the library catalog for books. You can scan the images you might include in a presentation or lecture. From the basic search screen enter the term you wish to use and choose within subject heading from the drop down menu to improve the precision of your results.