These crystal eye stickers are super easy to use. First, clean the area on your doll's face where you want to place the sticker to ensure good adhesion. Then, carefully peel off the sticker from the backing and gently apply it to the doll's face. Make sure it's centered and flat. When it comes to maintenance, keep the stickers away from sharp objects to avoid scratches. Also, store them in a cool and dry place. Remember, there might be a 1 - 2mm measurement error, and the colors in real life might vary slightly from the pictures. Enjoy decorating your dolls with these lovely eye stickers!