This young woman is portrayed in a relaxed and playful pose, standing on a board in a swimming pool. Her long, curly hair is pulled back from her face, emphasizing her bright eyes and wide smile. She is wearing a bright purple one-piece swimsuit, and her posture exhibits a sense of joy and freedom. Her arms are both outstretched, one above her head and the other to her side, while one leg is perched up behind her. To create a captivating visual, I would use a color palette of vibrant purples and deep blues for her clothing and the board she stands on. To contrast the dark blues and purples, a splash of yellow in her hair and a pop of pink along her cheeks and the edge of her swimsuit could bring out her bright and cheerful demeanor.
My recommendation is to keep the majority of the colors in the purples and blues range and limit the additional colors to a few bright accents here and there. This will bring more attention to her and create a whimsical, yet captivating aesthetic that will stand out from the rest.