I am going to agree with everything that you said- it doesn't have to be a brush for it to look good, nor for it to have taken a huge amount of time. Believe me, I have been given stick for not brushing loads of times, but hey. It's the 'in' thing to do, so I guess everyone has to do it, right?
Anyways, I am not going to bother talking about brushing in the chop as I am guessing, you have heard enough of it. So anyways, there is a bit of a weird shadow underneath the wheels and such, it looks a little to blurred, needs to me a tad sharper to match the other parts of the shadow. The reflections could have been copied and pasted from the car in the background to fit, but I will let you of with that one. Also, A little more negative camber on the front wheel- it looks a little 'off' at the moment.
Other than that, great work and keep it up

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