Status of US territories works as being made by Government employees is unclear. Compendium I said (page S-19) that they are not US government employees unless the territory is unorganized. This was confirmed in Compendium II (page 200-9), though the two were indecisive for District of Columbia works. Compendium III (page 30) concluded that territorial works were US government works. Checking the copyright entries for Jan-Dec 1958, the photograph does not appear to have been registered. Searched copyright.gov and find no renewals for "Official portrait of Hawaii/Hawaiian territorial senate", Hawaii/Hawaiian territorial senate", or "Hawaii/Hawaiian Senate" as a title or keyword.
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.
Uploaded a work by [http://archive.vn/6121u unknown] from https://web.archive.org/web/20200322212856/https://www.loc.gov/rr/mss/mink/mink-about.html Patsy T. Mink Papers at the Library of Congress] with UploadWizard