It's very good, if just a smidgeon heavy on the hammer-and-sickles.I know you're trying to make it more obvious that it's Chernobyl, but there are other ways to indicate this.
There's only 3 of those prints around.I'll just leave one near the sign-in.
You should also add some Soviet-Ukraine flags also.
But Chernobyl doesn't have any zombies in it.
Well, zombies could make sense if they were citizens who refused to leave Pypait, and then mutated or something to become zombies. Then to end up in the Power Plant area, they could have just found shelter there.
May I also suggest some liquidators?
lots of boxes and cans, but no sense is made. what is supposed to be in that room?also, as a suggestion, when creating rooms, try not to make them all storage, and instead add some room-specific items like heaters or generators, etc etc.