At the end of the day, you should learn from experience, not only your own but others as well. That way you have more than your own heart and soul when crafting your works.
Also, how Killroy's artist's name was so much value and not his crafts that a plastic bottle was considered a work of art is pretty much modern day artists. When was the last time you listen to a song because it sounded good and not because a mainstream artist made it?