The coloring page features a central green turtle with a brown shell and brown eyes. He is adorned with a red mask and two crossed katanas behind his head. To either side of him are two other turtles; one orange and one blue, both with yellow eyes. The orange turtle is wearing a blue mask and holding two katanas, while the blue turtle holds an orange mask and has a staff. Behind the turtles is a cityscape, with a sewer grate in the foreground.
To color this image, the most important part would be the turtles. For the green turtle, consider blending shades of green for his shell, and subtle shading for some depth. The red mask can be a bright red to contrast with the green, as are the orange and blue masks. For the orange and blue turtles, select contrasting shades of both colors to make them pop out beside the green one. For the cityscape, warm tones would be a great choice to bring life to the scene. The sewer grate could stand out from the environment by painting it with a grey or muted silver accent.