disclaimer: I'm a newb when it comes to detailing, but I know a few things about website design and marketing.
Except for what others have mentioned I think it looks pretty good. But if it were my website I'd change a couple of small things. The hot red on black type strains my eyes a bit. I would experiment a little on different colors and fonts, maybe try a neutral lightly textured background, with a black or dark color type instead of what you currently have. It looks cool at first but becomes harder to read the longer you stay on the site.
I would also change the wash packages page so that all packages are in a table that makes it easier to read. It also makes it easier for the customer to compare what they get for extra $$. Its good that you go into detail about what you do, but most people want the basic facts fast without having to read for too long to get the info. Then once you have their attention, you can go into more detail on the package that they think might be closest to what they need.
Pictures....Those are really nice cars, (and they're shiny!) but the average Joe isn't going to be able to tell what makes your work special because you have too many pictures taken at angles that make it hard to see what you did, or the backgrounds in the photos are too "busy" and distract from the work. I know your not a professional photographer, but take a look at some professionally done "car-porn" and notice the angles, lighting, and backgrounds that are being used for these calendar quality shots and try to do something similar. The nice thing about digital cameras is that you can keep taking pictures until you know you have a good looking shot.
The few before/after shots you have are great. I would do more of those with close ups of doors, hoods, etc to really show what a good paint correction and wax can do for the customer. Show off stuff that helps you up sell and make more $$, especially with your focus being quality not quantity, you really want to get the most $ from every customer you get. A few extras on a couple of jobs can make you more money than a simple package job, and you don't have to convince a new customer to give you business, you already have a job in your shop so 2/3 of the selling is already done!
How has the website worked for you so far? Have you gotten any feedback from customers about it?
I think in general your site has a great start, but the things I mentioned could help take it to the next level. You're in the business of Detailing, so you know how important the details are. The website isn't any different!
Take care,
Bud