This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. 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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
Notes: Verification on copyright.gov confirms no results for any subject, keyword, or person named Valentine Thomson. (Also verified was not first published in France. Check of Galica returns only one image of her here—clearly not the same, Bibliothèques Municipales Spécialisées also returns only one result, this one, which is not "of" her but rather produced by her, and Les Archives nationales, does not appear to have any photographs of her.)
Captions
Valentine Thomson, French journalist and suffragist