ok honestly that interior looks horrendous. make it less dark. Malls don't want to have a heavy feeling on its mallgoers; to avoid that they usually paint the insides light colors, sometimes yellow or beige or aqua, all saturated with white.
for blockland going pure white is gonna be ugly so try to mix up the color schemes. and get some lighting in there holy crap it looks so bad with shaders.
digging the skylight though.
