I told the artist some of the important points of the tattoo I wanted to stand out--one of them was the heat pits. For some reason, I'm fascinate by snakes' heat pits, and as this is one of the main way pythons catch their prey, I really wanted them to stand out. I think they do.
Another thing was their face shape, as it really is only ball pythons who look the way they do. All snakes are different so I wanted people to recognize, "OH! Ball python!"
Here are a few pictures of Nergal for comparison: