Try adjusting your gamma down and your contrast up. Play with that, it works best at night so you can tweek the lighting to look more like natural darkness in the shadows of buildings and natural moonlight shining on buildings will have a glow to it, especially undead eyes/NE eyes.
The default graphical lighting seems washed out and too bright I also have a couple of macros way back in 2005 that might help, I’ve kept them this long.
Graphical boost on (this is the tittle don’t include in macro)
/console groundEffectDensity 256
/console groundEffectDist 140
/console detailDoodadAlpha 100
/console horizonfarclip 2112
/console farclip 777
/console characterAmbient
/console smallcull 0
/console skycloudlod 3
Graphical boost set normal (this is the tittle don’t include in macro)
/console groundEffectDensity 16
/console groundEffectDist 1
/console horizonfarclip 1305
/console farclip 177
/console characterAmbient 1
/console smallcull 1
/console skycloudlod 1
/console detailDoodadAlpha 1