Books offer high resolution images of photographer's works. Search the library's catalogue for a photographer's name eg Bill Henson.
Photography books are on Level 5 in the 770-779 range. Some are held in the Large Book Gold section which is also on Level 5.
ArtStor is a database if images of artworks including an expanding collection of photographs. Type in a photographer's name or a subject.
Britannica Image Quest includes Getty images and much more.
Click on Britannica Image Quest, then click Electronic resource, login using your student number and webmail password
For a complete list of Image sources use Find Databases - Images list