At Demented Squirrel, I use Lightbox to display my images/works. I recently discovered that you (or at least I) cannot save those works when viewing in Lightbox, but there are other ways.
Way 1
1) Right click the preview image – the small image that links to the lightbox.
2) Select ‘Save Image As’ from the options and choose yourself a name and directory.
Way 2
1) Right click the preview image – the small image that links to the lightbox.
2) Select ‘Open In New Window/Tab’ and you will see the full-sized image in a new window/tab.
3) Right click that image and select ‘Save Image As’ and save it.
Hit the back button to go back to the page you were viewing.