Pablo Picasso's Guernica

Identify the style of the painting being analyzed and discuss the mediums, techniques, creative principles, technical features, and unique strategies of imaging employed by the artist. First page to 1½ pages of the paper needs to be devoted to technically discuss the style of the painting and what the artist did to personally, uniquely impact that style. Is the painting Impressionistic, Cubist, Surrealist, Pop, Abstract Impressionist, Photorealist, Neo Expressionist, etc.?