[3D Environment] Need your help

[Magnum Opus]

Hey there. I know there are good 3D artists here and good level designers (in this regard, it is true that some are very good). I'm currently on a little project for Amnesia, and this is the reason why I'm working on some environments. I would like some "experts" in 3D modeling or some people familiar with the level design to enlighten me. About what I could add to these assets to make them more "realistic".
So here is a screen. I think I'll update this thread with other screens if I make some progress and if some kindhearted souls are willing to guide me a little bit.
Screen ! : http://www.noelshack.com/2013-45-1383650...-titre.png

And here are my "references" :
http://www.noelshack.com/2013-45-1383650694-images.jpg
http://media.moddb.com/cache/images/mods...Image2.jpg
http://i.allday.ru/uploads/posts/2008-10...illar3.jpg
http://eat3d.com/files/imagecache/forum/wall.jpg

Advices ? Tips ? Ideas ?
PS : I'm working with 3ds Max and Mudbox.
Thanks in advance !