Quote Originally Posted by Sharpe View Post
Sorry I'm such a newbie. This is all a little overwhelming for me.
We all started somewhere.

I... I have no idea where to begin with that.
Make a new (transparent) layer on top of all your other layers. Then from the menu at the top select: FILTER>RENDER>CLOUDS>FOG, change colour to something good like very pale grey, then press ok. Then delete the parts of the fog that you don't want, such as over the walls, so it only is present in the open areas.