I'd suggest flipping the background horizontally and brightening it slightly. At the moment the lighting looks wrong on the car compared to the bg. I'd then lighten up the side of the background where hood/front of the car is, because that's where a lot of light appears to be hitting the car from.

Did you use the same wheel for front and back? it looks rather strange, If you did, never use the same wheel front and back.

Also dont forget to make the windows transparent, so you can see the trees in background.

Agree with the background been too dark.

keep it up

Yeah i know, and nope the wheel donors different, i might change the wheels but im defiantly changing the background, thanks guys