when starting to brush a car and want a dif bg do i jst brush the new shawdow etc or also the old ones X_X

first of.. the thread title is a bit stupid. Name your threads after your problem. HELP PLEASE is not enough.. Second. you seem to start threads every single time you face a problem, have you even tried? I think people here are a bit sick of doing your work. I'm sorry if I seem a bit harsh, but its actually making me angry. Many choppers learned this by trying out for themselves while others are just constantly asking for help.

Here's the answer to your question: Yes.
next time search for tutorials. We have a tutorial section here you know and it can be very helpful.

Answer: Yes. I agree with Danny. You just need to try and get feedback and more often then not in starting out in Photoshopping cars, you're gonna be fixing basic things more to make them perfect then doing new things