Although a photograph itself may not be notarized, the notary public may notarize a statement about the photograph. If the customer has a statement on the back of the photograph, such as "I certify that this is an actual photograph of me," and asks the notary public to witness their signature on that statement, the notary public may notarize the photograph. For this to work, there must be room on the photo for the notarial certificate, notary public signature and official notary seal.
For smaller photographs, the customer can make a statement about the photograph on a piece of paper referring to "the attached photo." As long as the notary public is just witnessing the customer's signature per the customer's instruction, the notary public may notarize.
After the notarial certificate is completed with venue, statement, official notary seal and signature, use the official notary seal a second time such that it overlaps the photograph and the paper it is attached to. Be careful not to cover the face on the photo. This action makes it clear to the receiving agency that the photograph is the one attached to the document when it was notarized.