Instead of Toyota Vitz they call it the Yaris in Europe, actually, I think they changed the name to Yaris in Japan, too. The PD guys are kind of slow. I'm not sure, though. I do know that Toyota is bringing the 2007 hatchback and sedan versions of the Yaris, still called Yaris, over to the States later this year. These cars will replace the worthless Echo. Go to any car mag site and search for pics. I never go to the sites, personally, I prefer their magazines.
Great pics, but I find that track kind of boring, so I'll comment on my favorites.
Number 5, the close-up shot, really stood out to my eyes. Speaking of magazines, I think this is the type of pic you might find in Road & Track. I like the slight roll the body has as it's cruising through the corner, it makes it look like it's moving even though the wheels aren't visible.
You should pay more attention to the placement of your signature, too. Most of the time the bottom right corner works, but, on occasion and as with #6, it'll be right in the middle of a busy part of the picture. In #6 your name is right on top of the line and the edge of the grass, not only making it harder to read, but drwing undue attention to it and also annoying me. That corner just has too much going on, ya know what I'm saying? I wouls have chosen either the top right or bottom left for the sig. Same deal with #7, he top right would be way better. Try to match the color of the word with the background so it blends in and looks like it should be there while still being able to read it.
I like #8 just because I wanted to say: Those are some big ash trees, y0!

I love the 12th pic because it looks so realistic. Not only is it smooth and well edited, but the way the car's body is leaning going into that corner is almost exactly like what would happen in real life. I see that sort of lean in my mags all the time with front drive cars. That's why they understeer so badly because when you turn and slow simultaniously all the weight shifts to the outside front tire, this effect is exaggerated even further by the fact that about 60% of the weight is being carriedby the front tires. The tire's grip can't handle the weight and starts to give way to understeer. It really is a super realistic photo.
I also love #17. It's a kind of psuedo-Top Gear style of pic, the way the cars face is attacking the camera. Top Gear's version would be edited a lot more, with high contrast and uberbright reflections, though. The little bit of motion blur you added was a nice touch.