Andrey Skull
Andrey Skull is a Bulgarian tattoo artist with a ridiculous talent for drawing and an especially keen talent for drawing skulls. All his drawings are created with mechanical pencil (0.5 lead). I imagine most have have been converted to tattoos or will eventually.
Andrey Skull certainly has the most skulls I have seen in someone’s portfolio and what is interesting to know is that he draws most of them without reference.