best quality, masterpiece, excellent illustration without defect, aesthetic and high-resolution wallpaper illustrated by siki, extremely delicate and beautiful girl, solo, hatsune miku, dress, long hair, twintails, black dress, blue hair, blue eyes, parted lips, looking at viewer, underwater, bubble, collarbone, sleeveless dress, bangs, sleeveless, floating hair, air bubble, very long hair, breasts, feet out of frame, hair between eyes, cleavage, bare legs, frilled dress, black ribbon, ribbon, frills