Brendan and I had a good laugh about this tattoo today. The tattoo was correctly done, but we were laughing at its meaning in Chinese slang.
In Japanese, 妖 【よう】 sometimes means "charming", but it would also mean "strange, weird, supernatural".
In Chinese, 妖 is used to describe "goblin; witch; devil; bewitching; enchanting; monster; phantom", or "seductive" as in 妖媚.
But in modern day, when someone is referred as a 人妖, it means he is a transvestite and/or transsexual, as in "chick with dick" or "tranny".