This tribal tattoo designed for Eric to follow the hip flexor going down along the thigh is inspired by Iban tattoo designs.

Since it's related to tenacity, water, and swimming we stylized a shark and a hammerhead shark in the design, overlapping in the center of the tattoo, and the whole piece is designed to closely recall a scorpion design used in the tattoos of the Iban tribes from Borneo.
You can see two traditional designs below as an example: