I was trying to highlight both the costume
and the person. There's no style guide for that one. Portraits generally try to highlight the face and fashion shots highlight the clothes. Here, the knees are where the costume stops being interesting: just boots for the girl in blue and pink socks for the girl in purple.
I took full-body shots too:
They definitely feel less personal because of the distance.
The group shot was more of an accident. The girls are actually stepping on someone as a joke. They lined up for that shot for someone else and I still had my 50mm lens on my camera. That was the only shot I could get--that's why the arms are cut off on the sides. The facial expressions were just so natural and delightful that I had to keep the shot, even though it is not optimally framed.