Colour me really stupid, but I still don't get how you know which are the "right words", because every image I look at seems to have something on it.

Especially this gallery:

http://rosy-poison.sakura.ne.jp/poser/gallerypro/gallery.cgi

I'm tempted to send an email with a guess of "Merry Christmas and Happy New Year" . It's 6 words (if that is the number that there are supposed to be) and it's seasonally appropriate.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi