In the coloring page, there are three Lego superheroes. The first is red with a bright blue cape that sways around him. The second is green and wears a sunny yellow cape. The third is blue and sports a bold red cape. They are all standing on a grassy green platform. To add texture and dimension to the image, try using different shades and hues of the main colors. For instance, the red superhero could have a deeper shade of red on the arms and a lighter shade of red on the cape. The green superhero could have lighter patches of green for highlights and the blue superhero could have a dark shade of blue for the body and a light blue for the cape. You could also add some white highlights to each of the characters to bring them to life. Finally, don't forget to make use of the white space in the picture; add small details like flowers, stars, and superheroes symbols to make it look more interesting.