First thoughts are always hmm, I wonder why she got that, r what it represents for her versus the first idea that comes to my mind. I've got tats, so I'm not going to wave off a girl with ink on her. I think a little goes along way and give a different edge to the girl's character. However the extreme stuff I cannot fully say for I've not dated a girl nor met one who was all decked out.
I don't like them. I don't care if they are hidden. I would never date a woman with any on her arms or face or place that shows all the time. and any piercing other then 2 in an ear forgetaboutit. looks stupid.
Neither sexy or a turn off. But lately it would create a negative first impression because it has become so mainstream that it makes me think you're one of these sheep that blindly follow the next trend. Like there is nothing special about you. Of course it may not be true, but that is a first impression.