Ok a little later than I planned but here's some feedback:

GT HP Nut,
aidan8500 and
Sinfour The main reasons your entries didn't make it was down to their composition. I appreciate how difficult it is to get right, particularly with photo travel, and trying to make a shot interesting to look at. If you can compose a photo nicely it makes editing so much easier; a poorly composed will always be a poor photo no matter what you do to it.
This probably sounds more simple than it is, but quite simply (

) your cars don't fit into the photo. It's definitely possible to highlight just one section/detail of the car, but you need to be careful how you choose to do this. In your photos it appears that the car has just been missed off.
If you're not sure on how to compose a photo, the best advice I can give you is just to look at the photos that make the polls. And if needs be, pick your favourite photo and just try to recreate it yourself.
GT HP Nut: My only other criticism is that the sky is too over-exposed. I know in my previous feedback I said some over-exposure can be a good thing, but for your photo the 'halo' effect on the sky is too strong and unbalances the rest of the photo. If you can, I'd start trying to edit your photos, take them with a lower exposure and then you can control the exposure of the photo through an editing program.
aidan8500: I think you've just gone too far with the editing. I'm guessing, but was the original photo taken with the warm filter? If it was, I think you'd be better off taking a photo with no filter and then adding a warm/sepia filter whilst editing. Set the colour balance first so that it looks realistic and then you can add filters after. Apart from that just consider the composition a bit more as with the angle that's on at the moment, it just looks unnatural. With photo-travel shots I always find it works best if I imagine I was actually there taking the photo.
Sinfour: A pretty good effort, but going back to composition once more, your photo more than any other suffers from looking like the car has been cropped out of the photo. I think perhaps this has happened because you wanted to highlight the rear 3/4 quarters of the car whilst still showing lots of the environment. If it was me, I'd focus more on the car and really highlight the design of the car rather than trying to fit everything in.

s:censored:t! How do I criticise your photos! If the poll was 18 instead of 15, you would have all made it. There's nothing really wrong with your photos, just a few things didn't work for me.
mattmflock: I'd like to see the car rotated further round (anti-clockwise), the front wheel sticks out right now, and I think it would really improve the photo to see all of the car. Secondly, at the top of the photo the trees/bushes look bad. Obviously this isn't your fault but they're still there, so I think I'd either crop them off or just not include them in the original photo. Or, you could try blurring them slightly, but admittedly this might not work.
hgrf93: I'm afraid the main reason you didn't make it, was because of
cphbullet's entry. The composition of both photos are similar, and I just didn't feel like I could include both into the poll. The sky and the reflections on the car are a just a tad over-exposed and this has meant that some of the detail has been lost. Apart from that, (
and this goes for everyone 
) could you try and remove the GT-logo and maybe add a simple border. It's a really minor thing, but more than anything its a really quick way of showing the effort you've put into the photo.
ZEROX: I don't think I should give you any feedback as you're good enough already!

As it happens
cphbullet has summed up what I would say. More so, the angle on the photo. For me it was just too much and it means that some of the environment has been lost, which on your photo, looked fantastic.
Hope this helps!