Pro Pics FINALLY!
alright here a few quick tips- always use a tripod for the sharpest images possible (even if the camera/lens has a "image stabilization" of some sort built in). But seeing that he shot the photos with a shutter speed ranging from 2-3 seconds he must have used a tripod or has the steadiest hands I have ever seen!

- good glass can make a world of difference especially when he is using a Canon Rebel XS... plus save a ton of time when post processing although it does not look like he does much PP but that will change as he shoots more.
- most cars are highly reflective thus stuff is then seen in the paint and can be distracting. A good way of preventing this is using strobes.
- he is using an extremely wide angle lens (as low as 12mm) which can lead to distorting objects/cars. It can create a cool effect if used properly though if he does not want any distortion than I would suggest something like 50mm and above in focal length. The higher the focal length also equates to greater DOF (depth of field) which means the subject in focus has more separation from the background/foreground. This effect can also be achieved by using a smaller aperture. I see he used aperture of f/9.0 for these which in my opinion is a bit much. I would use f/7 or faster.
that should be enough to get him going in the right direction as I don't want to bore you anymore than I already have.

1) Good glass generally equals more expensive glass (like Canon L series lenses) with better glass chemistry and better coatings. This (as well as other mechanical aspects) helps make for "faster" lenses with larger apertures like f2.8 or wider.
2) Reflectivity of the car is one of its major assets when used correctly. It is what shows the shape, color and beauty of the car. Taking pics in the right light is critical but just adding a strobe won't necessarily make any improvement because it is difficult to get right without the proper knowledge, equipment and location.
3) I think POACHR meant that the longer lenses give LESS depth of field, creating more separation between what is in focus and what is out of focus. That means that while the car is in focus, the foreground and background would be out of focus. This can be enhanced in post processing but the proper lens and lens settings you can achieve this effect without any additional "Photoshopping".
For instance, this shot was taken with a longer lens at f2.8. Note that the background is out of focus while the Vette's hiney is in sharp focus, mostly because of proper lens selection. It did later have some post processing to enhance the effect.
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You should post up some different pics. Looks great through.