More accurately, you are fine until you try to distribute them, or display them. Giving out free copies would not be commercial, but would definitely be a violation.
Well it's commerce in the sense of 'look at me I'm so great at art-ing.' You're sharing them for social rather than fiscal capital. If you anonymously mailed them out and kept your mouth shut I doubt any resources would be spent to track you down, or (if they were) that you would lose in court.