When did Picasso make his best paintings ?
In the summer of 1918 , Picasso married Olga Khokhlova , a ballerina with Sergei Diaghilev 's troupe , for whom Picasso was designing a ballet , Erik Satie 's " Parade " , in Rome ; they spent their honeymoon near Biarritz in the villa of glamorous Chilean art patron Eugenia Errázuriz .