To bring this coloring page to life, I would start by painting the sea in a deep blue hue, and the sky in a lighter shade of blue. I would add highlights of bright blue, purple, and teal to create a stunning background. I would add splashes and circles of brighter colors to give the ocean a wave-like effect.
Once that's done, I would add cheerful yellow rays of light to make it look like sunlight is beaming on the ocean.
I would then paint Ariel, Flounder, and Sebastian, making sure to use vibrant colors. I would give Ariel an orangey-red bikini top, bright green tail, and yellow and orange hair. For Flounder, I would use bright yellows, oranges and blues. I would give Sebastian a bright orange and yellow pincer for a hand, and yellow and red accents in the rest of his body.
I would also color the coral and other sea creatures in the background using pinks and purples, with specks of bright blue to really add to the underwater scene. Lastly, I would add a few bubbles with shimmery golds and silvers for a magical effect.
This coloring page would be full of color and fun with Ariel, Flounder, and Sebastian's cheerful faces, and would surely light up any room!