Why does this lady have a fly on her head?

Why does this lady have a fly on her head? | National Gallery

(The National Gallery, April 14, 2022) Francesca Whitlum-Cooper, the Myojin-Nadar associate curator of paintings 1600–1800, investigates this portrait's unusual addition. 🎨 Find out more about "Portrait of a Woman of the Hofer Family" website link: nationalgallery.org.uk... Digital activity at the National Gallery is supported by Bloomberg Philanthropies Digital Accelerator 🎞 YouTube: bit.ly/1HrNTFd