The VRoma Project is a community of scholars, both teachers and students, who create online resources for teaching about the Latin language and ancient Roman culture. It has a large image archive (about 5,000 images). They are of mixed quality, some go back to the late 90s and are therefore rather small. But you’ll find a lot of stuff here you won’t find elsewhere, and they are freely available for all non-commercial use on the web.
About a week ago I recommended The World of Roman Women, mentioning the many images. These images are all part of the VRoma Project, to which Barbara McManus and Ann Raia are the main contributors.