I thought i'd add a chapter about how i envision the characters - particularly the sisters.
JOSIE to me has long black straight hair. She doesn't use charms or products to keep it tame, despite being a Potter and having the genetic predisposition to have hair sticking up in all directions no matter what. She has green eyes like her mother, making her and Harry look quite alike in many ways. She doesn't wear glasses, setting her apart from her brother. She is slim but curvy.
LYRA has long curly flaming red hair that is completely untamable. It is quite striking and looks incredibly perfect, but that's because she taps it with her wand each morning and ensures that it remains in place. She has grey eyes like her father and, although she began Hogwarts as a complete introvert who spoke only in her own language with her twin sister, she quickly grew up and gained confidence as she found herself as someone separate to her twin.
CARINA has long black hair and a straight fringe that sets her apart from her older sister Josie. She has grey eyes, like her dad and her twin sister and a light spattering of freckles on her nose and cheeks. As she has grown, she has taken a liking to wearing dark muggle eye liner. She has always been extroverted and secretly wished she wasn't a twin.
NEVILLE was never the plump first year we know from the books and movies. He was brought up by his health conscious parents and was quite trim when he first started Hogwarts. He remained that way throughout the years.
DESMOND looks insanely like Neville, although with a more athletic build. His hair is longer and he is shy and quiet, until he isn't.
HAZEL is voluptuous and has brown hair that stops just below her shoulders. She has a round face and brown eyes that are the same colour as her hair. She is an extrovert with no interest in pursuing a magical career. She is quite smart but only puts in enough effort into her studies so she can graduate in order to please her parents.