My first tatoo will likely be "the vitruvian man" by Leonardo da Vinci. In fine, precise lines.
http://en.wikipedia.org/wiki/Vitruvian_Man
recently published analysis by TEDEducation:
http://www.youtube.com/watch?v=aMsaFP3kgqQ
But for that i need a special kind of tatoo artist. Fine lines, artistic spirit, and extreme precision. I mean, im asking for nothing less than a leonardo da vinci replica. It is so easy to mess it up because there is so much empty space / untouched skin between the square and the circle and the man, and all the essential lines are so thin. Most tatoo artists would have trouble doing this.