Main subject: Watercolor sketch poster of Paris city landmark views. Scene: Shown from a pedestrian eye-level perspective, Paris representative landmarks are in the midground, with naturally extending street/riverside space paired with large areas of warm white cold-pressed paper negative space, no text. Style: High-end watercolor city sketch style, travel journal watercolor illustration style, architectural sketch poster style. Tone: Low-saturation transparent watercolor tones, including warm ochre, light terracotta, blue-gray, lavender gray, warm beige and a small amount of plant green, base color is warm white. Lighting: Natural soft natural light effect, corresponding to the daily atmosphere of Paris, highlighting the light texture of watercolor color layering and slight bleeding. Composition: Vertical 3:4 aspect ratio, landmark views placed in the midground, foreground open and bright, using natural perspective with soft vanishing point, no crowded elements and large objects blocking. Purpose: Travel culture promotion poster, social media travel sharing illustration, cultural and creative derivative design material.