I can tell you have nice brushwork skills, you have angles on your walls, not so much just staight 90degrees etc. You also know how to have texture variations etc, Yes your lighting can use work, but it seems to me that this is still an early WIP. We do have many open levels, they include
Basement
Dam
Jungle
Library
Statue
Train
I personally would take basement, build your layout first using simple dev textures, after you do your layout go ahead and deck out 1 room and 1 hallway, just please do us a favor and keep in touch lol, so many people apply and dissapear! I had my own version of basement just about done but the team decided to scrap it, I would recommend having goldeneye run on your nintendo (if you have one) if not download an emulater and play it in the background. If you need anything let me know!
AIM: SharpSh00tah or you can always ask on the forums
Good luck