The coloring page is of three turtles swimming in a large body of water. The turtle in front is a lighter green than the one in the back, with the one in the middle being a medium shade. All of the turtles have their eyes closed and their mouths open in a peaceful expression. To bring the image to life, I would suggest using a mixture of brighter and cooler tones on the turtles, with the front turtle being the lightest. The water could be colored a mix of blues and greens, while the background can be done in yellows or warm blues to contrast against the turtles. This will create a vibrant contrast, while also helping to bring out the details of the turtles and their surrounding environment.