The curve of the roof is too tall and narrow, should be lower and broader. The back could probably go up a bit.
The tail lights should curve down, not up. The side of the front lights should be closer to the front tire. The gap in between them, narrower.
The door handles should be higher up.
That black thingie near the front tire should be wider. Compare that to the width of the door handles.
The lateral curve of the car as seen from the front goes out, then in, then slightly out a bit. I'd paint that with the lighter gray to reinforce that. And the bottom lines of the doors should follow that.
Also, I wouldn't use black for those lines, as it's way too dark and creates too strong a separation.
The hood of the car bulges up a bit and could probably use some definition to accent those ridges.