Yea it’s definitely illegal you can read about it here https://www.quora.com/Is-it-copyright-infringement-to-get-an-artists-work-tattooed-on-you-without-their-permission there is all kinds of answers to the question.

You’re right about him probably not ever doing anything. I mean he would probably never even find out, but if he did, you could be in a little bit of trouble.