Oil painting of an ethereal, monochromatic (grayscale) landscape scene. The composition should portray Tatsumi, silhouetted against the backdrop of a cascading waterfall in a serene natural setting, with gray-framed glasses accentuating his features and subtly illuminated belly button. Drawing inspiration from Danish painter Theodor Philipsen, employ clean brush strokes to emphasize smooth textures and realistic nature representation, capturing themes of introspection, harmony with the environment, life's fleeting moments, and quiet strength in simplicity and observation.