I'm a part time web designer and I had a look at your site. Wordpress is fine for the likes of blogging and such but for what you're after you would be better with a Joomla based site. Joomla is a content management system similar to Wordpress but has many different templates and add-ons. One of these add-ons is a shopping basket and easy sell system. This way your customers can just add the prints to the cart and stay on your site. I'd happily give you a quote if you are interested. Check out my website: cre-a-tive.co.uk