Hi Duncan, Your site has a good start. My initial thoughts after taking a quick look --
The Home page sidebar text (left side) is not fully visible unless you can drag the browser window vertically larger. Reducing the line spacing for this text or reducing the amount of text will fix it.
While I understand the concern we have about people taking and using our images without compensation, the watermarks on your images really detract from the quality. Maybe size them down by a small amount and add a logo/copyright watermark to the lower right corner.
The image of you on the Info page (although titled "About" by the browser) is noticeably pixelated. Since you are a pro photographer you might want to use a better image.