There are many murals in Shadow of the Tomb Raider. Each of them develops your dialect knowledge. This allows Lara to read new information and monoliths. These provide you with extra points used to further develop your character.
In the Cozumel location you will find only 2 murals. We have described the exact locations of each of them to make your search easier.
1. Heart of the Serpent
2. Temple of the Moon
Heart of the Serpent
This is the first mural available in the game. Above it, a message will pop up on how to handle the murals and what they are used for.
Temple of the Moon
After the first climb on the rope, a mural will appear. You can't miss it, it's on the path to the exit.