Screenshots of what you're doing.

Thanks, man! Good feedback! (feels just like old times). I have been working on stained glass. Do you think it added contrast? 
https://drive.google.com/open?id=1igi7Xh...2hqkhxfC9I
https://drive.google.com/open?id=1jyBU0D...6uePsAnJ5c
The problem might be that I am overusing the fog... It was supposed to be a night scene but with crazy auto exposure settings Unreal made it a bit... washed out.
I actually considered making it more... realistic and believable but I had to take care of other parts of map... Its huge! For example I wanted adding the flying buttresses (like you have drawn) outside the cathedral.... There was very little room for them, since they covered the view around the bridge. I had to resign from many options. After all I am a level designer and the biggest priority is always the movement and clarity. I had to make the whole map consistent and good looking, even if it meant that it won't look as good as one would like.
I completely agree with the continuity issues with rocks. There are small individual pieces that are put together to form larger ones... That's the price I had to pay for modularity. When it is better to make individual, unique rock pieces it's often worse for buyers, who can't use them in their own way. 
Once again, thank you!
And thanks to everyone else who liked it! Your words mean a lot!