Hi Craig,
If I suddenly had the urge to buy a watercolour print I'd go on to Google and search for "watercolour prints" or "watercolour paintings". In my opinion you should optimise your site for these phrases. Unfortunately your site doesn't come on page 1 for either of those and it needs to.
I'd change your homepage title to just "Watercolour prints by Stephen Johnson".
The page title for
this page should be something like "Lydstep, Wales - Watercolour print by Stephen Johnson". Keep the titles concise and have the most page relevant words at the start of the titles, i.e. Lydstep, Wales is more relevant to that page than "Stephen Johnson" so it comes first.
On your print detail page, why not add a little content about what's in the picture? your reason for painting it etc? (I'm thinking content for search engines).
Go out and get as many backlinks as you can! Ask other artists to link to you, suppliers maybe, put your signature in forum postings like this if rules allow. Aim to get 5 new backlinks every week. One easy way to get backlinks is to provide something genuinely useful to users for free.....how about a beginners guide to watercolours? A simple tutorial for newbies. You'd be surprised the backlinks you'll get for something like that.
Backlinks are key!
On another note, I think your images need to be bigger and sharper (maybe it's just my monitor). Usually I'd advise against large images but this sort of site is an exception - I need to enlarge the image and then think "wow, that's really nice" - there should be a "add to basket" button available at that point.
Just a few random thoughts.
James.