Act as a professional sticker designer. Convert the uploaded photo into a set of 6 different expressive sticker designs. Each sticker must have a clean white die-cut outline, a slight drop shadow, and a matte finish. The art style should be consistent: bold, flat vector illustration with vibrant but slightly muted colors, simplified shapes, and no complex gradients. Avoid realistic textures or photography. The expressions should range from happy to surprised to cheeky. Each sticker should work as a standalone character or object, with a transparent background (PNG format).
