Yo This is my new and second brush. Enjoy
Base:
Chop:

There are many errors. the tires seem transparent, the car is very toon, there are many shades and there is some obvious serration.continues to train with the brush that you will improve.

Heh Tires are don't transparent But this is my second brush

It' is by no means a bad attempt. So I will try and offer some advice

->Try and find a reference picture - so another car with shiny black paint - then copy the colours and reflections you see in your brushing - so use the colour picker tool
->Make clear selections - there are often bands of colour from light to dark that need to be present
->Highlights in paint often look almost white, and shouldn't be blurry unless it's matte paint
->Take your time and experiment until it looks good

Hope that helps

As for the rest of the chop, the styling is pretty cool I like those arches and the design of the rear lights - they're pretty cool

But keep it up Maybe try and mix c+p with brush for a better result while your brushing improves
Keep it up

Thx ATC