The first five years or so of a kids life are the most impressionable years [or so I've read]. So it's important to teach things during these years if you want them to really sink in and last throughout their life. Things like values, integrity, respect, and how to pose for pictures.*
My children have really picked up on random picture poses, thanks to my siblings. Here is my family's Christmas photo. Now you see. My son believes all children should pose this way, especially his dear cousin. In this picture my son is teaching his cousin some of the finer points of picture poses. Sometimes I wonder why my sister-in-law lets us influence her son, but I'm sure glad she does. Think of all the fun family pictures she will have in the next 18 years.
*please note that the importance of these items are not equal.