in #3 those swirl smudges in the door are very distracting to me >< lol cuz i know when i do car shoots the first thing i do is microfiber cloth the whole car real good with lots of pressures to remove swirls from waxing and stuff lol
I usually just come in this forum and look around at the great photos, but I thought I'd comment and say #4 is my favorite too.
And that car... Porsche has a way of making their cars look interesting, yet sophisticated, and its something not very many other companies can do (the only others I can think of are also German).
A little too much blue for my taste; blue sky, blue hills, blue buildings... The car doesn't stand out as much as it should, esp. in #3.
There are also a couple of minor technical issues, the starburst visible from the LH headlight in #1, and the hotspot near her elbow (#3) at the top of the rear window. As well, the license-plate masking is a bit of a detractor. I would consider removing the plates altogether, or getting specialty ones made if you're going to do a lot of car shoots.