First major issue I’d suggest doing is choose a better font colour. Light blue on white is going cause eye strain even if they can read the text.
Search button needs more customisation to fit into the theme. All I get is a grey box.
Use a contact form (such as Fast and Secure) to reduce Spam hitting your e-mail address.
The theme has an issue that I’ve come across many times and it’s why I’m doing my own custom theme to address this for my own work. When you click on an image you’re presented with the thumbnail and the full size image, which is both wasteful of resources and pointless.
Floating forward/back navigation is obscured by the image, which is confusing to some people.Plus it’s a duplication of existing navigation at the bottom (which breaks the alignment of your layout).
The theme doesn’t validate with W3C, probably a missing closing tag in the header.
Some interesting photographs to view and thanks for sharing them.