Web today’s side ponytails are subtle and loose. Super high ponytails (bonus points for anchoring them slightly to the side for the full effect). See keira knightly here for an example of the 21st century version of the side ponytail.
Ponytail hairstyles for black hair little girl
Casual ponytail hairstyles for long hair
Lee ji eun hairstyle ponytail
How the side ponytail went from '80s musthave to red carpet
So word to the wise, if you do.