The visual logic of the painting is defined by the extraordinary tonal harmony between the building and the sky. Monet utilizes a sophisticated palette of pale lavenders, soft violets, and murky yellows to represent the filtered sunlight. The sun, appearing as a faint, glowing disk, struggles to penetrate the dense atmosphere, casting a shimmering glow across the water. The Thames in the foreground is rendered with horizontal, rhythmic brushstrokes that capture the flickering reflections of the sky and the dark, blurred shapes of river traffic. He avoids hard outlines entirely, relying instead on the vibration of color to define form and depth. This focus on the 'instantaneity' of the light—capturing the visual sensation of a single moment before the fog shifted—was the ultimate goal of his urban campaign.

Technically, Houses of Parliament Fog Effect showcases Monet’s mastery of 'all-over' texture. He applied the paint in thick, vibrating layers of impasto, giving the surface a physical presence that mimics the tactile quality of the heavy air. He avoids the use of black, using deep indigos and saturated purples in the shadows to maintain the painting's high-keyed luminosity. Historically, the London series was a massive critical success in 1904, proving that the Impressionist method could find poetry in even the most industrial of settings. Today, held in major collections such as the Metropolitan Museum of Art and the Musée d'Orsay, the painting remains a beloved icon of modern art. It illustrates the moment when art broke away from descriptive realism to embrace the visionary power of pure light and atmosphere.