Obviously there is still some work to be done but im slightly stuck, does anybody have any good tips on how i should do reflections to make it look more realistic?

Thanks...

Orig:


Chop:

Less saturation at first, wheels need more shadows too

try to put some asphalt texture on soft light blending mode and maybe litlle warp.

somewhere I read that everything is gradient, there is no solid color in real life, every single even little thing is (soft or harsh) gradient, try to apply it to Your chop.