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.