One of David Hockney's famous "pool paintings" is coming to auction and is expected to sell in the $80 million range, easily breaking the record for a work by a living artist sold at auction. The British artist's "Portrait of an Artist (Pool with Two Figures)," to be auctioned at Christie's in November, is considered one of his premier works. Christie's has estimated the work at about $80 million, but says it expects it to sell for more. The previous record for a work by a living artist was set by Jeff Koons' "Balloon Dog," which sold for $58.4 million...