A few posts don't quite make an obvious impression of character. As far as I can tell, the three pictures are supposed to portray the three best aspects of a character's personality, or at least one interpretation of it.
Drake is right, this thread has the purpose to express your feeling over the character in pictures. No need to post three times the an image where the character only shows the same.
But, I like the three picture thing and how you get to express three (possibly) different aspects of the character you love so much.
Since, if it was just one picture to show that you like the interpretation of the character, wouldn't this be the same as "Favorite depiction of Touhou characters" thread?
...Although I do agree that you might want it to be three pictures pointing at different aspects of the character.
But then again using words to fulfill that purpose seems to defeat the purpose of the thread...