Thanks a lot for the comments, it's kinda late here so tomorrow I will post some more wires.

@jay; Yeah, I've to work with closer deadlines, right now I take too much time to work on a model.
...

I made this in my spare time, with no hurries, and it took nearly 4 months(with a lot of breaks). She's fully rigged and textured.

Render:
http://i16.tinypic.com/4lok8yq.jpg

Other: ...

I still think a Lamborghini Diablo may be a little too hard, try something with simpler shapes such as VW Golf, Audi TT, 350Z or a BMW from 1994-1998, since they are pretty squared.

You may want to keep some edges as hard to define the shape more, and avoid smoothing errors such as the one near the front wheel.

I kinda see what I mean, but I really want to keep this with low-specs, also I think when I finish creating the normal map and the specular some details will pop-out more.

I made a render with a...

To smooth the edges go to Edit Polygon > Normals > Soften/Hard. Click the square and choose a value higher than 90.

Thanks for the comments, I don't have yet much experience in creating huge detailed models, I would like to and I make some models with some details, the problem is when I start to detail things I...

The UV Map looks good you could still resize the part that's in the right corner(the part underneath the car I think). You could also smooth the edges.

Looks good, but try to keep poly distribution a bit better, it seems to me that you have some parts a lot more heavy than the others. It may give you some problems later on when smoothing.

@kinddoggofwar; that's the part where I will Alpha Map, it's the part of the texture where I will need extra work.

This is the current progress of the texture, the back part is the part that...