Latin American Posters Collection (Princeton University) - Scroll down.
Latin America Pictures and Images (Getty).
Records for many, but by no means all, individual Harvard University Library images are available in VIA, an online catalog of images. Records include subjects and a thumbnail image.
The Kerr Collections Online resources hosted by FAMSI,
The Foundation for the Advancement of Mesoamerican Studies
Includes the Maya Vase Database
Lacondon photographs, by Giles G. Healey
Tozzer Library Special Collections C.A.4 H 349 p EFOLIO
Many museums have posted searchable collections of online images from their collections: Directory: