Happy Little Waves with Smileys – Vector Water Bottle Sticker Prompts

Design a series of happy little waves with smiley faces, focusing on clean vector art suitable for die-cut sticker formats. Use simple, high-contrast line work without shading or gradients, on a pure white background. Create playful, cheerful wave characters with rounded features and expressive smiles. Incorporate placeholders [INSERT_COLOR] and [INSERT_EXPRESSION] to enable customization for varied designs.