By artist/title and a link to the painting? Would be a great reference facility.
On second thoughts, and with us lot in mind, it might be more useful to have it by title/artist followed by a link to the picture or print. eg -Stonehenge by William Camden http://photos1.blogger.com/blogger/6094/1623/400/William%20Camden%20%281551-1623%29.0.jpg
And as there are probably more prints than paintings on the megalithic theme, perhaps Megalithic Pictures or some such would be more appropriate - could be fun :-)
