Hi everyone, thanks for all the feedback
Have you considered office supplies to fill up the walls? Calendars? White boards? More Potted plants? Financial charts (the thing with the red arrow).
I would actually like to avoid clutter and keep the background as easy on the eye as possible ; if I add more stuff than what's already there it's going to be a mess
Have you considered having less saturated colors for background elements? Right now they all seem on the same plane so to speak so it's hard to distinguish what's in the foreground/background.
Right now the player can interact with lots of the elements that you see. What elements would you suggest I desaturate/make less visible ?
For me my issues are that I can't really tell what kind of office it is. Are all of the people there supposed to be waiting to see someone? Without much context it looks like they're waiting to see psychiatrist tetris player. lol
Good point ; people are actually waiting to see Mr Tetris player to pass a job interview, but the player will get that when talking to the different characters
Heyo Zanorin 
for the wall texture, maybe you can try :
1.Very light shading that darker as it reach the floor
2.Paint stain
3.Some pillar
I would avoid paint stains or anything that would make my office look in bad shape ^^ I also think pillars would add more clutter. Idea n°1 sounds cool, how many tiles would you use to do something like that ?
Here's what I've got so far :
I took inspiration from @CupOhJoe's floor tile which looks great, to make another carpet that doesn't read as grass, and
tried some texture on the wall to make you understand what I'm failing to achieve... Still looks terrible
