The photo has no copyright markings on it as can be seen in the links above and in the unedited copy of the file showing both front and back. See also film still article, which explains that publicity photos were traditionally not copyrighted. No copyright registered for this photo.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.