Your librarian, Karen Bouchard, can help you with your image questions. Please feel free to contact her for assistance with locating images for use in teaching, your dissertations, and other publications. I also can help you determine what you need to do about copyright and obtaining permissions, whom you need to contact, and how to go about it.
In addition, you may find the following pages helpful:
Thomas Rowlandson. Ackermann's Repository of Arts. Aquatint, 1809. Luna Collection.
Dresden. Postcard, 1898. Luna Collection.
Elizabeth Forbes. School is Out. oil painting, 1889. Penlee House Museum. Luna Collection.