Original character sculpted (with no references) and painted (Polypaint) in ZBrush. The piece in the ear, chain and screws are predeterminate tools of program.
Render in ZBrush + Photoshop
Data for the curious: the shoulder tattoo is an emblem made by Alexander Mair in 1605, about the "Memento Mori" (Remember that you can die). The chest tattoo is a 1545 Holbein engraving, called "El tahúr", from the series "The Dance of Death". And the neck tattoo is taken from a photograph of a gargoyle.
Sickboy Torso Sculpture