While I really love the build, I cannot call it realistic because of how blocky the environment is. The lighting can also be improved. You might also want to use some custom textures for better realism.
It looks pretty good, i’d recommend changing the wall textures (or atleast their colors) and replace these pillars with more realistic ones made in Blender. Other than that, i think it needs better lighting but the build itself has great potential, keep the good work!