It's a simple, well-designed site, with a refreshing absence of "clever" features, which is why it's good. That, and the excellent photographs, of course.
I do have a couple of comments:
1. You've used two different designs for the portfolio pages. "Horizon" and "Dog" show the images side by side, and (one of my pet foibles) the arrow keys work, allowing scrolling between them. The other three have the images above each other. Unless you have a good reason, I'd suggest sticking to one - and my vote would be very strongly for the side-by-side version.
2. Why write your "about" page in the third person? It's your site. It belongs to you. It's about you. Use "I"!
Jeremy