This beautiful scene of a mermaid floating in the ocean is sure to delight any aspiring artist! She is surrounded by colorful balloons, and her purple tail and long flowing hair make her look positively majestic. As for coloring, I would start with the blues and greens of the sea and sky, and then move on to the vibrant colors of the balloons - pinks, yellows, and purples. For the mermaid herself, I would choose more subtle shades and accents to bring her to life, like greys and blues for her hair, and lilac and lavender for her tail. Finally, don't forget to add small details, such as a bright pink coral or a tuft of seaweed with the same colors in her hair, to complete the magical picture.