Those are some beautiful cars. Must admit, they turn my head as well.
It's tricky getting a good shot in any kind of car show. In the first one, there's just one man looking at the car, background is relatively clean - fine. But generally, I'd say people just standing around looking at the cars often ruins a shot. They're very hard to avoid so sometimes you have to wait for them to move on. It's also hard to get an uncluttered background.
Try lower angles and detail shots. It's difficult to get a really nice shot with the entire car, but then again, it's not always as interesting of a shot to just have the whole car. If someone is interested in cars, they'll want to see the whole thing, but if the point is a photograph that someone would like even if they are not particularly into cars, then you'd have to get a bit more creative.
As is often said on this forum: just my 2 cents. Your mileage may vary