A masterful, cinematic, and deeply atmospheric full-body watercolor illustration of an anthropomorphic black cat detective, John Blacksad, leaning against a rusted, flickering lamp post in a rain-drenched 1950s urban alleyway, in the legendary style of Juanjo Guarnido. The character is rendered with exquisite anatomical precision and fluid, expressive body language, his ears slightly flattened against the cold wind, wearing a tan, weathered trench coat that shows the heavy, sodden texture of wet fabric and dark water stains. The art style features lush, hand-painted watercolor washes, utilizing a sophisticated "wet-on-wet" technique to create soft, bleeding edges and rich, moody color gradients of charcoal and indigo. The background is a masterpiece of urban noir, with glowing neon signs reflecting in murky, textured puddles and thick steam rising from manhole covers, all rendered with a painterly, tactile touch that emphasizes the grit of the city. The lighting is a dramatic "chiaroscuro" effect, where the cool, silvery blue light of the moon clashes violently with the warm, hazy orange glow of a distant streetlamp, casting long, rhythmic shadows across the wet cobblestones. The overall mood is "melancholic, hard-boiled, and viscerally immersive," capturing the silent, weary soul of a private investigator in a world of shadows.