By Javier Otazu New York, May 6 (EFE).- Sotheby’s New York presented on Friday an array of artworks that the firms expects to fetch $1 billion in all when they are auctioned later this month, down slightly from last year’s record of $1.3 billion. Highlights include Picasso’s 1932 portrait of Marie-Therese Walter, Femme nue couchee, …