Cinderella is enjoying the moment, smiling as she admires her reflection in the mirror. She is wearing a stunning blue ball gown with a full skirt and long train that swirls gently behind her. Her hair is swept up into a beautiful updo with curls framing her face. The sparkle of the rhinestones adorning her dress gives her a glow. To capture the fairytale atmosphere, I would suggest shades of pink and yellow for the dress, to reflect the magical quality of the story. For Cinderella's skin, a bright golden tone gives her a natural healthy flush. To highlight the beautiful updo, I would use a soft grey-brown for her hair, with rose gold accents for her tiara and earrings. Finally, for the backdrop, a dreamy sky blue with wisps of pastel clouds will complete the fairytale coloring page.