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Looks very well done,
one small critic, the renders are a bit too dark.
This looks like a classic gamma mismatch.
Your light bounces are clearly not able to reach full dynamic range and dim out exponentially. You clearly have a strong light source (lighting on the roof is already blown out), so lighting doesn't seem to be the problem.
What renderer are you using?
Are you using linear workflow?
It seems your gamma settings are not setup correctly.
Best to use a linear workflow and set systems gamma lut to 2,2.
Keep in mind with linear workflow you also have to save your images with a gamma correction of 2,2.
