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No, the perspective was off! The car was photographed from a low angle and the road from a higher angle! It was much better than your first attempt which you could have fixed by angling the car but you wanted the car to be level!

The BG had a light source going from left to right, the cars light source was from above! The shadow on the car would have been to the cars left side (our right) if it matched the lighting of the BG, so the shadows are off! You completely ignored any attempt to point this out much less make a correction! (a change would have been changing the car or the BG.........you wanted to use those two images!)

You can't just erase shadows and expect the lighting to work.

Even if you decide to try the cardboard box idea (great idea by the way) you will still have to learn perspective! Watch the video I linked you to!

Use the BG from above and build your own box using vanishing points, one to the left, one on the right, and one in the middle. Then find a real box photo and try to match the boxes perspective to the BG. The real trick will then be to match both the box and the light source to a new BG!