The World Digital Library has a page devoted to the Curse of Artemisia, which includes a nice introduction and description. More important, there are images there of the best quality. Click on the image and it will open up a screen which allows one to zoom in; the resolution is exceptional. The image can also be downloaded from the site as a PDF or PNG.
Update: See the nice post about the Curse of Artemisia at Judith Weingarten's blog, Zenobia.