“Her unconventional sales approach is reverberating through international art markets, worrying dealers and auctioneers accustomed to playing key — and lucrative — roles in the sale of renowned art. In an interview, Ms. Picasso said she would sell works privately and would judge “one by one, based on need,” how many, and which, of the remaining Picasso works, of about 10,000 that she inherited, she would put up for sale.”