When we still had the mixed Official/Unofficial Polls it usually happened that unofficial/informal photos were chosen.
So we nearly had at least 1 toddler-picture in a Poll that won in the end or at least was ranked very high. That's why we devided the Polls into "Informal" and "Official" Polls.
Later this month there will be published another informal Poll that will deal with "Royal Portraits".
To have an overview of all Polls, please have a look here:
http://www.theroyalforums.com/forums/f86/