I met Paul last month in Penn Station and he shared this tattoo on his upper right arm:
He didn't give me an explanation of the piece, but he did credit renowned artist Vincent Castiglia from Omega Tattoo.
In case you didn't know, Castiglia is a Brroklyn-born artist who, according to his Wikipedia entry, is "internationally acclaimed for his figurative paintings with metaphysical and often nightmarish subject matters".
Thanks to Paul for sharing this work by such an important artist!