At the Moulin Rouge by Henri de Toulouse-Lautrec

This is not whole oil painting, just a part of it.
Henri de Toulouse-Lautrec was a French painter, printmaker, draughtsman and illustrator whose immersion in the colourful and theatrical life of Paris in the late 19th century yielded a collection of exciting, elegant and provocative images of the modern and sometimes decadent life of those times. Toulouse-Lautrec is among the best-known painters of the Post-Impressionist period, a group which includes Cézanne, Van Gogh and Gauguin. In a 2005 auction at Christie's auction house, a new record was set when La blanchisseuse, an early painting of a young laundress, sold for US$22.4 million.

Stamp is Ludwigslust castle, issued on 2015-01-02

Thank You Karen!