It is common in book length material to give a citation of the photo, perhaps in a footnote. The title page, if present, or a page just following, is possible. So is a footnote on the last page, which is probably a list of references. Just mark the citation for the photo as "used with permission". The citation is necessary in any case since the work isn't yours. 

It isn't necessary to include the entire permission statement. But keep a copy of the statement.