The visual logic of the painting is defined by the extraordinary scale of the limestone arch (the Porte d'Aval) and the needle-like rock (the Aiguille). Monet utilizes a palette dominated by brilliant turquoises, deep emeralds, and sun-baked ochres to represent the high summer light. The rocks are rendered as massive, simplified forms of light and shadow, their textured surface catching the brilliance of the sun and creating deep, chromatic shadows filled with cool purples and blues. The sea in the foreground is rendered with short, rhythmic, and horizontal strokes of white and blue, capturing the shimmering energy of the waves and the spray. He avoids hard outlines entirely, relying instead on the vibration of color against color to define the forms and the immense depth of the coastal space.

Technically, The Aiguille and the Porte d'Aval showcases Monet’s move toward a more gestural and expressive application of paint. He used thick impasto to build up the surface of the rocks, giving them a tangible, sculptural presence that reflects the harshness of the environment. He avoids the use of black, using saturated blues and purples in the shadows to maintain the painting's overall luminosity. Historically, the Étretat series represents one of Monet's first systematic efforts to explore a single location under varying weather conditions. Today, held in major collections such as the Musée d'Orsay and the Metropolitan Museum of Art, the painting is admired for its raw power and its profound sense of solitude. It remains a cornerstone of modern art, illustrating the perfect union between his revolutionary eye and the natural world.