It's a decent analogy, but also taken a bit out of context I think. The verse that you are referring to isn't talking about tattoos, and cannot be implied IMO that it is. Even so, the tattoos that I have would not qualify as "scribbles" or "graffiti". It is art. If you were going to make an analogy, they would be murals or ornamentations. As an artist, they were meaningful to me.
That being said, I wouldn't do it again. I was in a really bad place when I got my tattoos. They remind me of that place, but more than that, they remind me of how I'm not in that place anymore and what God has delivered me from. I understand that for you it is just "scribbling", but I simply want you to understand that when Christians say things like that, it doesn't come across to most people the way it does to the pious. For me, it was never a "scribble". They are important reminders to me, even now.
I'm not offended, but one of the reasons it took me so long to get my life back together and give it back to God, was because every time I went looking for answers and found a new church, they were so caught up by the way I looked, that they couldn't see past that. To them, I wasn't a sinner because I was a suicidal alcoholic who fought with God, I was a sinner because I had long hair, piercings, and tattoos. When people say things like this, it only reminds me of why I hated the church, and why I saw all Christians as self-righteous hypocrites (not that I see you that way). I simply want you to understand how statements like that are received.