To search, use the Advanced Search page. To view images that are available for download, make sure you use the Open Access Available option:
When you have found an image, you can then "download lecture image" to get a large version of the image, and you can use the object record to create a link.
For example, this is an engraving of the goddess Minerva by Abraham de Bruyn, a 16th-century artist. National Gallery of Art.
