Looks like it has potential, will be interesting to see the finished result. However, don't forget to change such that you don't see the old bg through the window in the car. Also blur all the edges of the car such that they fit better in the new bg, now the car is too sharp against the environment. Looks C&Ped into the bg. Easiest way to fix it is by taking the waterdrop tool and smudge the edges a bit. Also the bg's perspective seems just a tad off. Transform it and squeeze the top together, as in move the top of the bg down, that should sort the perspective differences a bit. Can't tell you how much you should change it, you'll have to test.
But it looks like an interesting concept,
Cheers!