masterpiece, best quality, cute chibi anime sticker illustration, super deformed character, loose and soft art style, simple rounded shapes, playful and fluffy atmosphere, pastel color palette, clean white outline, sticker design, expressive pose, energetic and cute expression, brown eyes, chestnut brown hair, wavy bob hair, loose inward curls, hair between eyes, small cat ears, fluffy natural cat tail, medium-small chibi proportions, :3 expression, Mimi holding a giant snack bag proudly, puffed cheeks, one hand on hip, excited pose, playful cat-like attitude, cozy and silly mood, floating snack crumbs, tiny paw-like gestures, large japanese text: 「おやつは別腹！」, handwritten style lettering, cute comic-style typography, simple pastel background, soft shadows, clean composition, highly readable sticker layout