What is an art journal? An art journal is nothing more that a creative sketchbook, where you keep your thoughts and creative ideas. A place where you express yourself. It's actually what you - and only you - make of it.
Art journaling is something that many artists have done through the centuries - to paint, sketch and experiment. Whether Leonardo DaVinci, Pablo Picasso or Frida Kahlo. They all practiced and experimented in their sketchbooks.