Like a slender Santa, artist Lucian Freud lays a finger aside of his nose as he leaves The Wolseley, a restaurant in London, England, on January 22, 2008. That gesture is pretty much the extent of the available comparisons between Lucian Freud and Santa Claus. Lucian Freud was born in 1922, many years after St. Nicholas.
Just to carry this absurd comparison to its conclusion, the reference is to Santa's departure in Clement Clarke Moore's poem A Visit From St. Nicholas: "And laying his finger aside of his nose / And giving a nod, up the chimney he rose." Perhaps, rather than rising up a chimney, Freud is calling a taxi.