That's a very nice attempt at brushing!

Really good try! And a very creative kit too, which is always good to see, however I agree that the splitter should perhaps be a bit lower to match with the sideskirt
In regards to the brushing:
Try and find a paint reference, and look at how light and shadow falls over the car - you'll notice that there are no reflections faded over it, a little like you have done on the side, but more blocks of colour
Perhaps reduce the number of 'sparkles' too, and don't have them quite so blurry
Other than that, good stuff

Keep it up