As an undiscovered artist, he is better situated than most: living in a rented, 2,000-square-foot house in the Hollywood Hills off Mulholland Drive, with a Porsche Panamera in the driveway, plenty of natural light and a pool house he has transformed into an art studio. From the edge of the sloping property — it was leased for $12,000 a month starting last June 15, according to the homeowner — he has a view onto the San Fernando Valley below: Burbank and Universal Studios to the east, the 405 freeway to the west. For years, vodka and cocaine were constant companions....