The brick wall looks dandy, and so do the plants. If angled correctly, the would be perfect for the sides of the frame.
I also like that you've given the copper a classic smiley. I've also done this to all three of my coppers.
Is this for the film were I play the snobby beard man?
Anyway, I've taken some suggestions from here and elsewhere to fix my model.
The improved version of my Darkmoor Automobile:



The curves on the front have been moved forward so that the engine comes out less comparatively, I've also reworked the rear to make it slightly less tall, and I've worked a curved thing there which puts the wheel at an interesting angle (based off of that last picture from FM). A gauge has been added to the cockpit, and I've added several more black details in various places.
The back is still slightly large, but much less so than before. There are also still some weird lumps near the windshield, but I need to have them there for the glass to stay in place. It was especially difficult to get that bothersome piece to even be there because pf the uneven width. In the end, I couldn't even get it to properly attach, so I made it in such a way that it can fall out, but only if the car is turned upside-down. Luckily, I don't plan to turn the car upside down in the film, so this shouldn't cause a problem.
As an extra detail not pictured, I've put a letter in the passenger seat as though the driver had left it there in the way that many drivers tend to leave random things in their cars when alone.