This tattoo is not just a depiction of a predator skull. There can possibly be hidden the way more deeper sense.
In this Predator Skull tattoo besides the skull itself we can also see the thorns or maybe even a crown of thorns, which make this tattoo idea the direct link or an allusion to the biblical narration. However noone will ever know, if we take the assumtion that this skull tattoo is somehow connected to the biblical stories as a truth, why it has to be the animalistic skull.