to it's own scale it's 8/10
to player scale it's 6/10
Also, post a side image of the car damnit >:C
if a player is 3x wide and the seat is 2x wide, it's too narrow
you don't have a shifter
license plate? (it could be that little narrow grey brick but license plates are a little bigger than that my friend)
Door handles?
rearview mirror
turn signals
WHERE THE forget ARE MY CUP HOLDERS
get vertical plates and you can easily make this 10/10 with the ammount of detail you could put in.
Edit
If you want, I own a convertible. I can take some pics for you and see if you can improve the overall shape of the cahr. The windshield is too steep and ideally should be at more of a 45 degree angle. You also need to decide if your convertible is a hardtop or a fabric top. Mine's a hardtop so it's the same color as the car, fabric would be darkest grey but not black.