One of my biggest graphical pet peeves with this game since WoM has been the default object lighting. To me, the 'lit' sides of objects (units, buildings) has generally been too bright and the shadowed side much too dark. IMO this makes the game two dimensional, because you can never really use all 360 degrees effectively.
So tonight I spent a couple hours tinkering with the lighting settings and finally came up with something I'm happy with and thought I would share.
Note that I only changed the lighting on game objects, not on terrain.
Download here. Placing the file in your mods directory should work.
I never knew the slaves had scars across their backs! Awesome.