Design a sophisticated and minimalist logo where the letters "LZY" are seamlessly transformed into a simple, elegant smiling face. The letter "L" forms a smooth, curved smiling mouth, while "Z" is stylized into two closed, relaxed eyes, symbolizing a happy and peaceful expression. The letter "Y" becomes the nose, integrating with the overall facial structure. The design should be in a single color, with clean, continuous lines that evoke a sense of elegance and playfulness without additional decoration or elements. The style should be minimalistic, yet playful, creating a sense of joy and high-end appeal. Use soft curves and smooth transitions between the letters, ensuring the design is appealing to both children and teenagers while maintaining a modern, premium aesthetic.