I think what USSR looks for is Dimension, Creativity, Size and Function.
You need to add indents to the building, shape whatever to kill that square look.
With that, creativity, meaning design and color, outside and inside. If you could, try to make the interior walls different from the exterior.
Size..Well it's big, but they may want more big.
Function, try to add little things to do around there, even restriction with gates and fences
that prevent access but through the holes you can see what's behind.
Just a few suggestions.
Good luck.
4/10