I don't have any lighting mods, personally. I used to use 
Gunmod's Lighting hack from MTS 2, but didn't put it back in after installing Seasons. I think the lighting in that EP to be amazing. Other than that, I only do some minor tweaking in PS to adjust the brightness/contrast and a touch of sharpening. 
Try looking through the 
How to TAKE pictures and the 
photshop tutorial threads for some ideas.