(masterpiece:1.3), (best quality:1.3), (Kotobuki Tsumugi:1.4), K-ON!, long blonde hair, thick eyebrows, warm brown eyes, gentle smile, elegant refined girl, playing a black grand piano, hands naturally on piano keys, looking back at viewer, sheet music, royal blue concert dress, elegant formal dress, floral hair accessory, no school uniform, concert hall stage, soft spotlight, warm lighting, birthday mood, clean anime style, detailed face, beautiful eyes, natural hands, elegant musical atmosphere

(worst quality:1.45), (low quality:1.4), lowres, blurry, jpeg artifacts, pixelated, bad anatomy, bad proportions, bad hands, malformed hands, extra fingers, missing fingers, fused fingers, twisted fingers, extra limbs, missing limbs, distorted face, asymmetrical eyes, cross-eyed, ugly face, long neck, wrong character, pink hair, blue hair, black hair, short hair, twin tails, ponytail, wrong eye color, missing thick eyebrows, school uniform, casual clothes, swimsuit, maid outfit, idol costume, armor, broken piano, malformed piano, wrong keyboard, extra keys, missing keys, floating piano, disconnected hands, hands not on keys, impossible playing pose, nsfw, cleavage focus, exposed underwear, see-through clothes, erotic pose, exaggerated breasts, exaggerated hips, multiple girls, duplicate character, extra person, dragon, monster, animal ears, horns, wings, tail, weapon, random object, text, watermark, logo, signature, artist name, credits, username, speech bubble