Another wip from me:
Does it fit on the background?
Im going to try next to get reflections corrected, but I need some ideas so give them to me please!
I like the skyline, try using the original car to copy&paste the paint job. That way you can learn how all the reflections work.
As for the aristo, I don't actually like the background, it is a bit boring. Your shadow is also a bit hard. try to soften the edges a little bit. (just like the shadow in the skyline pic)
The latest bg is definitely the best one. Wheels don't suit it though. Maybe just make their color hue a bit warmer. And wrap a tire instead of a rubber band around the front tire please! Latest wheels' style is better but the previous fitment was better. These ones look like they are touching the arches.