Well it was hand drawn (on a computer) so...
It does include a fence post element. Does that count? Are fence posts copyrighted?
I don't sell my art because I don't want to sell art. I was a teacher for twelve years and I guess I just formed the habit of giving my brain away freely. It's fun.
I make and repair machine parts for a living and most people don't know how to do that thus there's a market for me, so that's what I do to pay the rent.
If I dreamed up a million-dollar machine part, I'd might try to sell that so I could retire. Never had much luck or ambition with that so I'll probably just retire on my pension if I live that long.