Illustration is a type of art where we present and create a certain character, story, or just a form, which we enrich with artistic elements.
Painting is a type of art where we use paints (either oil or watercolor) to create a story through visual elements, where we depict images in the most realistic way possible.
Drawing is an art where lines create a whole, we can use any color. The techniques are mainly brush, ink, pencil or pen.