I found your blog via a Google search for 'Magritte'. Your blog is very interesting, even if it isn't about Magritte like I was origninally looking for. 
From my understanding, Google Images has been relabelling images in an attempt to make itself better recently. It's possibly that the images you posted are now in the first few pages of search results for 'Magritte' in the new improved Google Images.
Commenting by HaloScan
