Thanks for your replies and nice comments everyone. 
Shane, I hadn't considered that about the gallery navigation, I'll put that on the Possibilities list! Not disabling right-click was a conscious decision as it doesn't really stop people pinching photographs anyway. I put my watermark on the images in anticipation of them possibly being copied and used online, so if left intact at least it may bring in some site visitors. I kept my preview images down in size so that they aren't much use for anything other than website viewing. The non-live e-mail links were deliberate, to discourage e-mail address harvesting programs, as explained on the page! 
Jon, yes, I intend to sell prints sometime in the near future. The .biz domain was my favourite out of the available options for DT6, so I probably would have chosen that one anyway, even if not intending to sell prints.
Marj, thanks, that was the aim - to keep it simple. I built it with Dreamweaver 4. It's just as well that I wanted to keep it simple because I don't know much beyond HTML code!
Mike, 'Dorset and 'Photographs are my top two key words! I built the whole site round a specific set of key words with Google in mind, right from the meta tags and page titles to the page text and alt tag text, all with an eye on keyword usage and density. The only place that I haven't made best use of optimization techniques is with the image file names themselves, but I might go through them and sort that out. I'm waiting to see what Google makes of it all before I make any adjustments!
Thanks again everyone 
Mike