I like the idea (car and such), but using better textures and optimized materials would change alot!
https://wiki.splashdamage.com/index.php/Specular_Maps
https://youtu.be/SQrHkKnSBcA
Watch these two links, very short and good explained.
Have you checked the specular effect on for example the front bumper material?
Your bumpers doesn't reflect at all. All basic modding stuff can be learned easly by Zmodeler 3 creater itself.
https://youtu.be/GuYapRP7Ta0 [Enable Subtitles]
https://youtu.be/1PQ_wwBC_LA [Enable Subtitles]
You can learn mostly the basic stuff by converting a GTA IV car model to GTA 5, because it already have LODs and optimized materials which Zmodeler convert better.
It will worth to optimize them, because your "detailed Interior" won't be look detailed if no physical light hit of the graphicfull Rage Engine. The materials you have, look like a comic in the game. You have pretty the same effect if you don't convert any of the materials to GTA 5. ZM will set them all to default on export. Choose a accurate shader. Import a GTA 5 car, and look how R* done all the parts. What flags the models use, what material the interior use and so on.
Some tip: vehicle_mesh and vehicle_basic shader are pretty good for intensive normal map effects.
Please texturize dashboard plastic with plastic dashboard textures. There are alot of free texture packs on the internet, including normal and specular maps.
You will get more light on the edges of the model, and you will able to see the all the details more like and realife, and not like a edgles 2d model if u know what i mean.

For a good start of normal maps try this
http://cpetry.github.io/NormalMap-Online/
It also allows specular, displacement and much more textures.

Burn area will be explained in Olegs videos from above