First, thanks everyone for your comments !
now i'll try to answer to questions but before i start, i must give some precisions : when i started the project i didn't intend to make an optimized map. The main purpose of this work was to make a beauty shot maps, so i hope you won't be too disappointed about the poor optimization
I tried to keep a good definition on all objects of this scene, i also tried to make as much generic elements as possible in order to re-use them later.
Close shot of the wall texture :
iniside -> i made most of my textures on zbrush and used photoshop to give them some color, using both photo sources and painting.
ParoXum-> Yes i have ! actually i'm at HEAJ =) http://guillaume-provost.infographie-heaj.be/
but it is not finished. Also i improved some works and i have to update some of them =)
Justin_Meisse-> thanks, i agree, i'm thinking about it ;)
MeintevdS -> you're right, and based on the original source i intend to add some foliage to get some color variations.