I feel that some of your photos need some processing because they look a little bit flat (in my monitor). Simply doing an Autocontrast in Photoshop I think you might obtain better results.
Concerning the usability of the webpage, I was not able to see a complete gallery but going again to the main page of the gallery and clicking the photo. There are some links in a photo of a gallery pointing to photos of another gallery.
And of course you have wonderful photos across the site.
Hope this helps