Hmm, if its about getting a job then I'd suggest topics in the likes of:
Art and interface design: Since a lousy interface can totaly ruin a game and usualy companies hire interface designers for menus, I'd look into that topic. Since Interface design is not 100% art creation, I feel like it can easily be a seperate topic.
Artists within development team: A list of all types of artists that can be found within the idnsutry. From concept artist to 3D modeller to pixel artist.
Development phases and the artist implication: Since different development phases mean different artistic needs
Development Platforms and their art requirements: Creating art on PC games is quite different than on Flash or Nintendo DS or PS3 platformes. Maybe look in the major plateforms , like NES, Game Boy, Playstation, etc, an d look how the restrictions of the sytems influenced the art direction. How did the artist creates so many games using so little color and tiles? That could be quite interesting. Just look at how many games have the "flash" look because the restruction of early flash development. Or how many games were created on the Gameboy that had only had 4 shades of grey.
Japan Vs American Vs European Art direction: Japanese games have an history of being deisgned by engineers. American games come from programmer designs. European game design have a background of coming from an art design philosophy. That's three differnet game design apporach and how the artists are involved in the design process is quite different. Maybe that could be an interesting topic to look at.
Interesting Art Direction list: A list of games that had interesting art direction that influenced other games. Like Gran Theft Auto 3 or Sonic the hedgehog. Or how Dragon Quest mainained a very similar art style depsite going through about 4 generations of consoles. Games like Rez, Vib Ribbon, Conker's Bad Fur Day, Super Mario bros 3, Mario 64, Little Big Planet, The Sims, Street Fighter 2, MegaMan, Mortal Kombat 2, Mad World, Psychonauts, Ico, Shadow of the Colossus, Rayman, Earthworm Jim, Meroid Prime, Resident Evil, Resident Evil 4, Silent Hill, Crazy Taxi, Soul Calibur, God of War, Viewtiful Joe, Okami, Katamri Damacy, wii Sports or Metal Gear solid are just a few games that influenced the industry with their art direction (among other things)
Teamwork: Since everybody works as a team in development, maybe that could be interesting to see how artists work with other team members.
Well, I hope this helps you spark some ideas that could help you.