A big blue butterfly flies in the central poster, plain poster, minimalism, spacious, sky, blue, pink, pastel yellow, bright theme, birthday, word “U”, HD, 4K

(nsfw:1.5),(AS-Young-Neg:1.3), (monochrome) (bad hands) (disfigured) (grain) (Deformed) (poorly drawn) (mutilated) (lowres) (deformed) (dark) (lowpoly) (CG) (3d) (blurry) (duplicate) (watermark) (label) (signature) (frames) (text)