As someone who for years hoped to be a car designer, let me give you a few pointers. From the get go, I see that you've jumped into photoshop just a little too early. While it's great to know how to use photoshop, car designers primarily depend on rough paper sketches. Now, I say rough... but that isn't meant to be chicken scratch (that's what I used to do), but rather 2-3 minute sketches that focus on one part of the car... or a whole, simply to get your ideas going.
With your design above, I feel that you may have overused photoshop as a tool for complete design design, rather than a medium to express your ideas better. What i'm trying to say, is that you are trying to show a clear cut picture, but what would be so much more interesting is the thought process behind your design. And to do this... it would be awesome if you could show several designs of your Bugatti that you've tinkered with. Learning about perspectives and drawing them is something I forgot to mention actually. Knowing how to draw cars from various angles, and not only side drawings is one of the most, if not the most critical skill you can have as a car designer. Not being able to draw a car correctly from a certain angle is the difference between your car looking like a Fiat Punto rather than a Ferrari (its a far fetched example, but what the hey).
Now, onto what I feel is even better advice:
www.cardesignnews.com
I'm hoping that you have visited this site by now, because its extremely helpful for any future or current car designer. Be sure to hang out in the forums, and especially take heed of all the tutorials they have. You'll notice that like what I said, their tutorials are all based on paper drawings that have been somewhat mildly touched up in photoshop. Even moreso, if you really are intent on becoming a designer... enroll in their premium membership, it'll really be of help. And here's a warning too: Take an extremely good look at what people have to say about schooling/preparation/careers. A large part of my decision to not become a car designer came from these forums, so I do hope they'll be of good use to you.
Here's a quick link for all the tutorials:
http://archive.cardesignnews.com/studio/tutorials/index.phpThis is some of my work from about 4 years ago, when I stopped drawing cars. I had gone from drawing weekly for about 4 years to doing some unrelated design work... to not really designing anything now. Shit, when I think about it, the pictures I have scanned are pretty much just drawings and not made-up cars. Maybe I'll get around to scanning some more.


And an interesting story about this one. Around the time I drew this, news started emerging about BMW releasing an 8 series follower. Well this is what I thought it would look like when it came out. Mind you, this is a considerable time before the 6 series was actually released. This is my drawing, and its extremely close to what BMW actually released.