Wh was one of Picasso 's friends who acquired one of El Greco 's masterpieces ??
Francisco Pacheco , a painter and theoretician who visited El Greco in 1611 , wrote that the painter liked " the colors crude and unmixed in great blots as a boastful display of his dexterity " and that " he believed in constant repainting and retouching in order to make the broad masses tell flat as in nature " .