There's a rather large blank space at the top, occupying significant vertical space. Since vertical space is most precious on all screen orientations, I'd consider cutting it.
The art on the 'visual' page looks very interesting, but clicking on them does nothing. At least make them links to the images themselves. The two with school buses are my favorites. I'd move them to the top to make the best first impression (though this is of course subjective! Place your best works first).
A few complaints:
- on phones, the line spacing in the beige boxes on /about is too high
- I think the headers on /cc and /visual need tome tweaking
--- the spacing between the quote to the actual headline is too big
--- on CC, it took me a while to even figure out what the header was because it was nearly indistinguishable from the years
- the feedback tab takes you away from the website, despite looking identical to the other tabs.