masterpiece, best quality, amazing quality, highres, Japanese summer greeting postcard, traditional summer greeting card, Shōchū-Mimai postcard, refreshing seasonal atmosphere, peaceful and heartwarming mood, elegant Japanese summer feeling, portrait orientation, vertical composition, 3:4 aspect ratio, Japanese postcard format, carefully designed vertical layout, professional postcard design, storybook watercolor illustration, soft watercolor painting, gouache and watercolor hybrid texture, outline-free art, no visible outlines, painted edges, soft pigment bleeding, subtle watercolor blooms, gentle gradients, airy brushwork, paper texture, hand-painted appearance, minimal rendering, simplified forms, picture book aesthetic, refined visual design, not overly detailed, soft and clean appearance, large open sky occupying the upper 40% of the image, soft summer blue sky, large white cumulonimbus clouds, light atmospheric perspective, main greeting text area occupying the upper third, clear typography space, comfortable negative space, excellent readability, a glass wind chime hanging near the upper center, transparent glass texture, gentle reflections, subtle summer breeze, small paper strip moving softly, visual flow: sky → greeting text → wind chime → cat → chibi characters, main subject: a large fluffy white cat, peacefully sleeping on a wooden engawa, relaxed stretched pose, soft fluffy fur, round cheeks, small pink nose, slightly curled tail, gentle sleeping expression, occupying approximately 30% of image height, positioned in the lower center, clearly the primary focal point, small chibi cat girl, brown eyes, chestnut brown hair, wavy bob hair with loose inward curls, hair between eyes, natural small cat ears, natural cat tail, 2.5-head-tall proportions, simple picture-book styling, standing beside the white cat, holding a small slice of watermelon with both hands, warm cheerful smile, looking toward the cat, occupying approximately 8% of image height, small chibi cat girl, blue eyes, long blonde hair, hair between eyes, single braid, natural small cat ears, natural cat tail, medium breasts simplified in chibi style, 2.5-head-tall proportions, simple picture-book styling, sitting beside a small basket of summer fruits, gentle smile, looking toward the other chibi girl, occupying approximately 8% of image height, both chibi characters significantly smaller than the cat, supporting characters only, never competing with the main focal point, balanced triangular composition in the lower area, white cat at center, chibi girls placed left and right, stable composition, pleasant visual rhythm, traditional Japanese summer elements, morning glory flowers, green leaves, watermelon, bamboo mat, small goldfish bowl, gentle summer breeze, subtle seasonal details, cool color palette, sky blue, aqua blue, mint green, soft ivory, light wood brown, small accents of watermelon red, tasteful, elegant, refreshing, nostalgic, comfortable, inviting, large Japanese text: 「暑中お見舞い申し上げます」 font style: elegant handwritten brush calligraphy, modern Japanese brush lettering, refined ink flow, high readability, slightly decorative but sophisticated, font color: deep indigo, traditional Japanese navy blue, strong contrast against the sky, text placement: upper right area, occupying approximately 20-25% of image width, not overlapping important elements, surrounded by comfortable negative space, additional text: 「2026 Summer」 small Mincho-style serif font, placed beneath the main greeting, subtle and elegant, real printed premium summer greeting card quality, professional typography, high readability, beautiful balance between illustration and text

low quality, worst quality, blurry, photorealistic, realistic photo, 3d render, cgi, cell shading, hard outlines, thick outlines, comic style, manga screentones, overdetailed, hyper detailed fur, excessive texture, visual clutter, busy composition, crowded layout, dark atmosphere, heavy shadows, dramatic lighting, neon colors, oversaturated colors, large characters, character dominance, characters larger than cat, multiple cats, extra animals, cropped cat, cropped characters, cropped text, unreadable text, tiny text, floating text, misaligned typography, sparkling eyes, glowing eyes, lens flare, bokeh overload, watermark, signature, logo, frame, border