Nice start.
While the grain is interesting I really feel like it detracts some of the atmosphere you're going for. I would keep it in but turn it down quite a bit
The grain is coming from the low sample value when i render in blender cycles. This allows me to render faster. So for later previews I will turn it up ofc.
I think you should push your window'd wall back a bit and add in the wrap around hallway like in the concept - it'll add some much needed depth to your scene
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While the grain is interesting I really feel like it detracts some of the atmosphere you're going for. I would keep it in but turn it down quite a bit