Technically Asoaresb hasn't done anything wrong. As you said, it's a different colour, it's rebrushed and it's a completely different design too.

But the problem remains is it morally right? Is it right for copy the brushing and reflections that Jack took hours upon hours to select the right places for the reflections and the right tones? I guess it's fine if it were Jack's tutorial but this wasn't a tutorial.

Now it could be said that "it's a studio background - of course the reflections will be the same" but a fact still stands. Does every car in a studio background have the same refs? Of course not - there are obviously going to be lights in different spots and the angle will be slightly different, such that the refs may be completely different.

There's absolutely no reason to be using someone else's chop for a reference picture. Plus you'll get a much more realistic and satisfying outcome if you use your own imagination or a real photo as a reference picture.

Just my 2c.