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Thanos, to make the grass adjustable, just make a grass mesh yourself.

common sense 

Nah, I actually said that because I (erroneously) thought that the grass was made with some grass generation algorithm.

It looks nice textured

you can try doing some subdivision modeling, by leaving the model as it is, and then cut the faces very very close to the front edge of the screen.

EDIT: Uuh now that I think about it it can be a bit tougher than I thought. Good luck on that pal 

 

I remember that they were constantly falling off the track because of the high speeds
Oh! Oh! Will you make those bridges too? The ones supporting roads passing over other roads?

We like it we like it!
The air exit holes, are they bumpmaps?

Well if you really need to un-subdivide a mesh like the above, maybe kubajzz's unsubdivision script might help (not always a guarantee, but here it is: http://an8.the-meadow.net/Com/ASLTopic/unsub.zip )

Are you familiar with ART and its attributes? ( http://www.anim8or.com/download/preview/art_raytracer.html)
Maybe after ART rendering with attributes at the eye material like i.e. class glossyreflector, Ks of 0.7 (<--play with this one!), roughness of 20000 or so could make a more realistic effect on the eyes. Also try lowering the diffuse and/or ambient and raising the specular, and making the eye bulbs slightly curved (to make a wet shine effect).

There are a lot of things we can do with rendering, but this is a lot of try-and-error. Although I think it's worth to familiarize with.

[EDIT] Hm, I think I'll try making some tests myself by applying a white texture on something and I'll tell you. I'm also curious
[EDIT 2] Whoa, mistake. Keep the diffuse near 0.9-1   I'll do some more tests.

Thought the assault rifle from the first Halo game would be simple to do.

Was it?