Improving the graphics

http://gameillusion.net/stuntrace/stunttrack1.jpg

I made this track on my latest project… I added background, but the graphics are very basic, no lightningeffects, shadows and stuff…

So… .I wanna know what I can do to improve the eyecandy-factor, except add more detaljs, I will make it more detaljed, will do alot… but I asking for the effect-stuff as bumpmapping, shadow/light-effects that make that I already got less plain.

*** EDIT*** I found and added a bloom-script, looks awesome. Now it´s pretty much only shadows and maybe bumpmap(if possible) remains.