Ok, I cannot find the relevant place on their site anymore, but for the El Greco image I used and cropped, it is already on wikimedia commons here: 

http://commons.wikimedia.org/wiki/Image:El_Greco_051.jpg

For the Pericles one:

http://commons.wikimedia.org/wiki/Image:Pericles.jpg

The others are all from HM of C. I sent them an email for verification of it. It hsould come frough within the next day.