If you are going to call yourself a tattooist you had best be prepared to perform some traditional tattooing, and it doesn't get much more traditional than Celtic Knots.
This is very early on in my career, the 3rd through 8th tattoos I ever did. I don' t mind telling you that I was terrified as well! Though I'd not have any problems doing these again for anybody (and I guarantee they would look better!), at the time it was a daunting task. I did learn a lot, and if I'm being honest, these pictures are post touch-up -- I didn't get the solid black right at all, it was much harder and more time consuming that I had anticipated.