There is quite the list of folks here who are displaying some great works! I have one on the back of my leg that my Queen did on me a few years back when I taught her how to do it. (It is one of only a few she ever did) The work was a version of the sigil that I customized for myself.
I have only done a few on other people that outright display one of the many classic symbols of Satanism. However, I have done many demons, and of course, I have done Paul Booth's baphomet (from his flash) a few times.

Thank you all for sharing your own Art on You!

Hail Thyself!
"The sleep of reason brings forth monsters."
~Francisco Goya

"When Hell is Full of Souls, The Tattooed Will Walk the Earth."
~Bob Tyrrell, The Night Gallery Tattoo