Looks pretty nice mate, nice and clean. The white works really well. A few issues I would personally sort out though - the mesh you've used in the front is way overused. I would advise making your own in photoshop - really easy to do if you use layers properly and you end up with your own unique mesh that nobody else has
Secondly - the sideskirt doesnt quite look right, I'm guessing its due to it looking too dark compared to the rest of the paint, or it looks like its stuck on there without much care - try to integrate it better with the car.
Thirdly - the reflection on the windshield would reflect only the roof of the "garage", and seeing as the roof is dark there wouldn't be much of a reflection there at all so you would see a lot more of the interior. Use this to your advantage and create an awesome interior.
The porsche GT2 bumper works pretty nicely on the Saab which surprises me. Last thing, maybe make the white paint a bit darker to go with the background. White paint is one of the easiest colours to brush due to lack of reflections, but making it fit the lighting of the background is extremely difficult for fear of the paint looking grey or silver. Just practice, you'll get a lot better at it with time, use reference pics to go by and they'll help you learn how light plays over the body of a car and where light comes from etc.
I'm not trying to be harsh there ^^ but I wish people had pointed things like this out to me when I was getting better. Practice makes perfect, and constructive comments help a lot. On a nicer note like i mentioned at the beginning, it's a nice chop and pretty well done, just a few schoolboy errors that are easily fixed
