However, I don't think everyone considers the full implications of tatoos and piercings. If someone came to me looking for a job and they've got a dragon coming out of their shirt collar, two full sleeves, some kind of bone in their nose and a couple of soup plates hanging off their ears they're not going to be taken seriously.
Rightly or wrongly that level of "enhancement" suggests to me someone who doesn't care what others think about them and who doesn't take well to authority. It also wouldn't be a look appreciated by most of my customers. As I say, I could be wrong, but I'm not going to take the chance to find out.
I suppose we all tend to judge by appearances, which is unfortunate, but it's a reality. OTOH, it can be misleading. I probably look quite conservative (57, short hair, clean shaven etc) but I really don't give a damn what other people think about me and I'm not comfortable with authority, which is why I work for myself. I have no problem with your employment criteria, but then I still believe that he who pays the piper calls the tune. An old fashioned view I suppose, and at odds with current employment law..........