no scratches on the paintwork, car interior regularly cleaned and de-smoked, whatever..
5) In addition to the pictures, some text on the front page welcoming the potential customer and praising the company a little (I dunno, top professional drivers, no scratches on the paintwork, car interior regularly cleaned and de-smoked, whatever...) would make it more immediately appealing - If I happen on a page with no text and just large pictures and some links, my first impulse is to move on to the next site.