Local reports say artwork was of Marie-Thérèse Walter, Picasso’s mistress and ‘golden muse’ On The Ground newsletter: Get a weekly dispatch from our international correspondents Get a weekly dispatch from our international correspondents Get a weekly international news dispatch Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice French drug police made a stunning discovery during a routine narcotics raid in Paris , stumbling