Does anyone here know classic artwork?

[robkelk]

I'm spending the day at home so I don't spread my cold to everyone else at the office. I've just made a page on the freebie wiki for a set of poses based on classic artworks (ranging from Classical Greek to 20th-century French, from what I could tell). The thing is, I only recognize roughly a third of them. Can anyone identify any of the ones that I couldn't?

I'm the first to admit that this is a tricky request - the poses have almost zero context remaining. Making images of them with the default figures didn't help, and in a few cases I could only approximate what little there was left as hints for the sources of the poses.

Here are the images, each one numbered. #1 (The Thinker) is in the information box; the others are in the gallery.

Any help with identifying these pastiches would be appreciated.

(I'm thinking that I should recognize #20, but I can't place it... <sigh>)