The stamp is from 2010 French Art series honoring William Turner with his work "The beach in Calais at low tide".
Joseph Mallord William Turner (23 April 1775 – 19 December 1851) was an English Romantic landscape painter, watercolourist and printmaker. Turner was considered a controversial figure in his day, but is now regarded as the artist who elevated landscape painting to an eminence rivalling history painting. Although renowned for his oil paintings, Turner is also one of the greatest masters of British watercolour landscape painting. He is commonly known as "the painter of light" and his work regarded as a Romantic preface to impressionism.