1. Google Images: You can perform a Google Image search for "John Brown" to find a wide variety of photographs, illustrations, and paintings depicting John Brown.
2. Library of Congress: The Library of Congress has an extensive collection of John Brown photographs and images. You can browse their collection online or visit the library in person to view them.
3. National Archives and Records Administration (NARA): NARA also has a significant collection of John Brown images, including both photographs and historical documents. You can search their online catalog or visit one of their facilities to view these materials.
4. Museums and Historical Societies: Many museums and historical societies dedicated to American history or the Civil War may have John Brown photographs and images in their collections. You can check the websites or contact these institutions directly to inquire about their holdings.
5. Civil War Trust: The Civil War Trust is a nonprofit organization dedicated to preserving Civil War battlefields and promoting education about the Civil War. Their website features a collection of John Brown images, which you can view online.
Remember to give proper attribution and credit to the source when using any images of John Brown for educational or research purposes.