The 3D tattoo of a snake would stop some people in their tracks. It is a very striking image, because the snake has always been associated with danger or evil. A man who wears a snake tattoo definitely has more to tell.
A snake could mean all kinds of things; a Christian might associate the image with evil.
This is an obvious symbol, since their bible vilifies this creature. It was a talking snake that led the first human to sin against the creator. A man wearing this could be highlighting the fact that human beings are always battling temptation.
Other men might look at the symbol and connect it to rebirth. This connection is made because the snake has the unique ability of shedding its entire skin. In essence, a man wearing a snake might be telling the world that he has changed who he is or that life forced him to shed his old self.
The snake is also associated with cunningness, which could mean that the man wearing it is aware of just how cutthroat he really is. This kind of man understands that life is hard, and you need to be aggressive to make it through this life. There is no room for the weak, and the snake tattoo shows the world this hard truth.
No other creature carries such strong connotations, so there is bound to be many interpretations, but no matter what, the image looks dramatic and intense.