I get what you're saying, but disagree. "Chef" kind of already means "professional cook" and "contractor" is kind of a legal term when it comes to construction, but if you draw in your notebook, you're definitely an artist. You may not be a good one! And you may not be professional. But who cares?
This is why we have qualifiers: "I'm an award-winning chef." "I'm a world-renowned artist." "I'm a professional designer." Of course you shouldn't go around calling yourself a doctor just because you once successfully took an aspirin to get rid of a headache. But when it comes to creative endeavors, I think more people should be proud of the creative act itself, even if it's not great on some objective scale. And I wish more people would attempt casual acts of creativity. And I think those who do deserve to wear the title of "artist, "designer," "cook," "painter," "writer," or whatever.