Characters is the first of three art galleries featured in God of War: Chains of Olympus. It is unlocked by beating the game on any difficulty, and displays images of various characters and enemies encountered throughout the game.
The Environments is the second of three art galleries, and is unlocked by completing the Challenge of Hades. It shows the artwork of various places and locations in-game.
The Outtakes is the third and final image gallery in God of War: Chains of Olympus, and is unlocked by beating the game on God Mode. It shows images of various characters and enemies that were cut from the final version of the game.