This is a case where you might want to consider upping the resolution/size of your BG images. I find on my big screen (1920×1200) that the images are a noticeably fuzzy/pixelated. Not awful or anything, but since I’m so aware of things like this, I do notice it. I’d want to load time test this, too, to find an optimal tradeoff between time and looking good.
I think that for sites that have “beautiful” images important to the goal of the site, that it might be better to error on the side of pretty over fast.
Maureen, this is a very well planned site. I knew immediately what the business is about. And the parallax is so well done. It kept me interested all the way down to the footer. The website view on my android phone looks great too. I agree with Lambert that is is a benchmark site.