Both posters appear to be from the Stalin era.
There is nothing funny or aesthetically interesting about Joseph Stalin or the era.
He was a cruel and sadistic mass murderer.
One is from the Russian Civil War, the other from WWII. That was indeed the Stalin era, but remember, we and they were on the same side in that one.
I agree with the poster who said that these posters might be quirky and even what you might expect for a dorm-room or first post-college pad, but they really aren't the sort of thing you'd have around your place once you own a house and are raising kids.
It's similar to why they have multiple copies of the same books -- if it's not some photoshop era. These people aren't actually living in the house. I'm not saying it's an obvious front or beard situation, but their real lives -- if they have any -- are elsewhere.