London cityscape, architectural landmarks, cloudy sky, warm sunlight, historic buildings, Gothic style, pointed arches, ribbed vaults, flying buttresses, ornate carvings, grand entrance, iconic clock tower, Big Ben, Houses of Parliament, Westminster Abbey, St Paul's Cathedral, modern skyscrapers, glass and steel, reflections on windows, urban landscape, city streets, pedestrians, red phone booths, classic double-decker buses, afternoon light, soft focus, atmospheric perspective.