not a bad chop at all mate. the difference clouds effect you've used for the lightning in the bg isn't too bad but COULD be better. The chop itself is extreme, just how i love it. the colour seems to be matte? not sure if that's what you intended and for a stormy night, theres sure a lot of light bouncing off the car
From what I can tell here, you've got the principles of shading, highlighting and overall the initial elements of brushing together. So your skill is promising. I think you should lose the lightning and rain effects in future chops. It cheapens the overall chop unless you can pull it off really well (of which both effects are extremely hard to do properly btw ). Keep on practicing as I know you will improve quite rapidly.
Welcome.
Nice ideas in this chop.
But some parts and the whole color look extremely bright and the reflections on the windows are too strong.
The Brush is well done.
not bad , maybe as advice i would say when re-designing a car try to follow the car's lines .. i mean a tt is more round so you could have used rounder shapes for the new design ..
th eliptical tool i think for you at this stage could be very handy
as for the rest what they said ^^^^ (above)