2 feedback points, do with them whatever you want:
1) the site gives a bit of squeezed in a box feeling to me somehow. Maybe its an idea to move the content and left menu a bit lower to give the top menu /header some more space of its own. (or only the left menu a bit so the word portfolio is the same height as the first photo / text heading).
2) the footer text has no font, so it defaults to times for me. The rest of your site is arial so it different and it looks a bit weird if you ask me. Maybe change it to arial aswell.
I think it looks good. Personally, I’m one for dark designs. And I agree with Chris that lightboxes do look best on a dark page.
A maturity warning on the page for "nudes," I’m not so sure of.. I mean come on, it’s not pornography. I think about 90% of the photographers out there with nudes on their sites don’t have anything of the sort. Kind of takes away from the idea of it being "art"…. only my opinion of course. (makes me think that one day they’ll be putting maturity warnings on swimsuit ads)