Hey dude,
Progress is good but I have some words..
-Get that Xacto ASAP
-Get that black paint ASAP
I like the red contrast that the wing gives the rest of the car but I feel it's too big for the GT-R. One about 2/3 the size would fit the lines better.
Your paint is on pretty even but I notice a layer of orange peel. That's pretty common with Testors brand paint and from where you are, there isn't much you can do about it. If you want to know what I would do, I would sand down the coat that's on there until it is smooth (no I didn't say sand it down to the plastic), and then spray another coat of white. Then clear coat it and repeat the process, then polish the clear coat. But as of right now you have no clear coat, so you can't just sand and polish the body, since you'll be risking reactions between a polishing compound and the paint.
Keep up the good work. I would like to see this turn out nice and clean.
Oh, by the way, my exhaust pipes beat yours.