If you want a clean and bold look for your picture, you can use colored markers for the color. It has a wide variety of colors and you can choose between fine tipped ones and broad tips depending on your needs. There are also refillable markers where you can just purchase ink whenever it dries up or loses its color. It's also an easy material to use. You just have to apply a single coat on the drawing. You can also add some more details using either a white colored pencil or a white inked pen.
Coloring Tips and Techniques. First of all _ choose what coloring material you would like to use. There are lots of coloring materials to choose from like: crayons, colored pencils, markers, soft and oil pastels, and many more. It's your choice which media you'll be comfortable in.