Not to be mean or anything; just asking:
Are you new to mapping?
I am saying this in the nicest way possible, but your maps aren’t the best looking.
What I would do is study up a bit more on how Displacements work and along with that: Sewing.
I can see that the displacement in the top left is sticking out.
Sewing should fix that.
The outside lighting needs quite a bit tweaking too, though I am sure it’s just your Graphics settings.
The inside lighting however is too bright.
I recommend changing the HDR to 0.6-0.75, or whatever feels best.
One last thing is those pillars.
I can count every single vertex on those rounded pillars near the entrance.
I would increase your Vertex count a bit if you want a better effect, or even make the round part smaller.
Overall, for a beginner, it’s not that bad at all.
Better than what I was capable of starting out.