Great work on the Rex.
I'm really liking the image as a whole because its busy and very atmospheric and the flame looks spot on!
Just a few small things.
-The floor water is blueish, where as the car as a whole is very red/yellow, so I would run a filter on the car body.
-The crease on the boot is smaller then the original base image making it look off.
-and I personally dont like the sticker on the car, it doesnt fit properly, you need to make sure it follows the bend of the body panels. Also, you need to make the lines deeper/darker where the doors are to make the sticker look real and not flat.
To give you a rough idea.
I agree on being one of your best, keep it up mate!