Chiang Kai-Shek and Madame Chiang by Samuel Johnson Woolf, 1937, oil on canvas, from the National Portrait Gallery. The National Portrait Gallery has explicitly released this digital image under the CC0 license. (<a rel="nofollow" class="external free" href="https://npg.si.edu/object/npg_NPG.86.TC79">https://npg.si.edu/object/npg_NPG.86.TC79</a>)
Samuel Johnson Woolf
National Portrait Gallery