All of these works were tough, because in most cases they weren't turning up in normal searching, even after repeated tweaks of the search terms. For more tweaking ideas for the Correggio, I looked at the titles of similar works, some of which included names like Abraham and some prominent saints--but the names were no help. Other terms from the titles finally did it. I don't think I used 'assumption'--I think I found it when I included 'apotheosis.' (As you know, one can get a bit spacey after searching a lot of images, and it can be hard to remember what was the final key.)
The Turner should have been the easiest. But I think I overlooked the painting when it popped up in early searches because I wasn't recognizing it from the detail (easy to do when looking at small images of large canvasses). It was only looking at the titles of similar works that led me to include 'Trafalgar' in my search terms.
I think horseshoecrab's find (the Giovanni Della Robbia) may have been the toughest (along with the Sir Lawrence), because I couldn't find it even when I searched on 'tabernacle.'
Thanks for another great challenge, CTyankee. This one was tough--but I guess I'm addicted to the weekly combo of torture and fun. (Do you think I need to see someone about that?) 
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