It's just that Jesus wasn't born when tattoos existed. He would get one now, because he lives and all, but he either doesn't want to for some reason, or he did get one and just didn't have a reason to tell us.
I've always been amazed about rose tattoos. I love the way they look and how detailed they are and what you can put with it in a sleeve like clocks or morals. I can't wait to get one soon I am thinking about getting one on my left arm.