Nice work buddy, you've not gone overboard, and you've used the car's original colour well. Subtle changes, it's what I like to see while people are still improving. Props on getting the camber right too (Negative front, positive/straight rear)
I'll point out the things that could be improved upon though, as this would be a useless comment if I didn't. Although the car is white, you need the tiniest amount of that blue sky, and greenery reflected in the paint. Either bring the exposure of the paint down, or over-expose the background to make it more integrated.
The windscreen doesn't look right either due to it having one solid colour over the top of it. In this background, you would get a fade from the other side, to transparent at this side, exposing some of the interior.
Lastly, the undercar shadow is slightly too prominent and dark. Give it a slight brush with the eraser around the edges, but not enough that you're actually deleting it, just taking some of the opacity out of the edges, and also rough up the edges a bit more. The edges of your shadows are perfectly smooth, yet the car is sat on gravel. Oh, there's a few clone marks on the floor next to the car too
Great work nontheless, work on those points I mentioned an this is a really nice chop.