Incredible! You are a macician of virtual tuning! Very very good!
How I'd like to know how to brush ...

Good style)) Now your bg more likely to me with bigger car)) Keep it up, your progress is very great

Looks great man! Only things that bothers me:

1. Some of the white refs seem to be brigther than they need to be. Forexample, the ref at the bottom of the sideskirt would naturally not be as bright as it is now - as far as i can see, that is your brightest reflection. And those reflections come often by studio lightning - so they wont fit to the current background choice. Same with the reflection on the rear arch.

2. As stated earlier, the car looks a bit off for that background. I dont know what to do, maybe move it a bit up to enlargen it compared to the background - or just change it, is what I would have done.

3. Do add some darkness on the windshields, they seem way to "see-through" at the moment.

But overall, this is a awesome chop! Great use of donors, and great execution. Im following this bro! Glad to see you back here around again