I have now basically started a dissertation instead of a simple online project. However I will be able to offer it for free as the institutions that hold the most important artworks all allow for reproduction and some transformation (cropping) which makes it infinitely easier to create a file that is easy to read and simply laid out!
When I began this project it was before a ruling on access to artworks at museums, and what rights there are to photos of paintings, and so I had to put all my images as links in an appendix! I can now put cropped images in the body of my text as well as have a very well rounded bibliography and photo credit appendix!
The abundance of information I can now access is incredible compared to when I began my various websites!