Hey Zizka,
I definitely think it kind of resembles an some sort of office! So you've got a pretty good start on this!
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
Also, since this is supposed to be an office I'm not sure if the ground is supposed to have green carpet? But, it definitely reads as grass and dirt. I would definitely try to play around with showing some sort of titled floor. Did a quick paint over on the top floor of the office to show you what I mean. Just tried adding some darker dirt, concrete, and just tried adding a floor tile.

Digging the look and feel of this for sure. I would just try to make to add some more stuff depending on what kind of office it is and work on the floor titles. Coming along for sure though!