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2. http://artxchangenetwork.com/Artist.aspx?idPics=183 (page 1 for The Concert)
I don't need to know what the paintings look like and the blog seems useless.
The assignment is clearly for YOU to write about what YOU think the themes of these paintings are. Here is a website that may give you better insight into what a theme is:
Another way to think of theme is to ask yourself what the "hidden message" is that the author/painter wants you to understand from his/her work.