using the slippers and not a person image helps not to limit your market or give any preconceived ideas of what the children should "look like". Used a combination of pale and light pink to add brightness.
featuring the tutu that a little girl would love to wear in a dream bubble to express your objective with a girly type but not script so young people can read it still! (a person image might indicate a 'type' person where just the tutu is more flexible)