The vibrant blue of the sea creates a stunning backdrop for the graceful dolphin. Its gray-and-white body is accentuated by its long, curved nose and delicate fins. As it moves through the waves, its long curved tail swirls in its wake, creating a mesmerizing underwater ballet. Surrounding the dolphin are brightly-colored fish - cheerful orange, sunny yellow, deep blue, and lush green - giving it a world of diverse color to explore. Together, the dolphin and its sea animal friends create a picture full of delight and freedom. To bring this scene to life, I would use cool blues to color the water and then fill it with a rainbow of shades to complete the picture - oranges, yellows, blues, and greens - to make the fish glow against the sea. For the dolphin, light gray and white with subtle shadowing will make its beautiful shape stand out against its aquatic friends.