Young Writers Society

I agree with the previous commenters (reviewers?). The 'main character' business makes things sound stilted an interrupts the fourth wall. I think "subject" or some other synonym might be more appropriate here.
Also, I'm not quite certain if a review is meant to encompass edits or not, but I'd just advise that you re-read this, because there are a few instances where you're missing words and such. Or in your second paragraph, you have a misplaced modifier. You say that "it" had never been opened, but the subject of your last sentence was a book - in fact, what had never been opened was a cabinet. In your... fourth, I think, paragraph, you write '5'. While not technically incorrect, this makes your writing look juvenile. It is always better to type out numbers, and it's fairly mandatory to type out numbers under thirteen(ish). Unless, of course, you're referring to something like "Districts", where the number would be part of a proper title.
Okay, now I'm editing. I'm sorry. It's kind of ingrained. I'll try to get back to general reviewing.
While I do like the distant tone you've adopted, kind of Snicket-esque, it seems to me as though this is a prologue, and the main body of your story will be told in a more traditional third person. However, this is just my impression. It could be that you intend to keep it in first/second person the entire time. If so, though, I might suggest you not make the last sentence quite so final, so that it lends itself more to continuation.
Honestly, from this prologuey thing, I'm not entirely certain where your story's going. The premise seems interesting enough, though your focus on the girls' appearance, especially the older two, might turn some readers off - I found it distracting and unnecessary, for example; I simply don't care what Zee's opinion of herself is. You as the author like your characters already, and it is your burden to make the reader like (or dislike) your characters as much. In addition, you start with a description of the girls and then the declaration that they're moving, and this starts the story...? It doesn't flow, and it's kind of disruptive, as I don't quite know where you're going with it.

All of this makes me sound really mean, so I'm sorry. Truth be told, I think you show a lot of promise and that with a clearer idea of where you're going and what you want from this story, you could take it somewhere interesting. I advise outlining (even though I, myself, find it doesn't work) if you can make it work. Wading in with a clear direction always makes the process so much easier than diving before taking the depth.

Above all, keep writing! This is me making a happy face without descending to the level of actually including an emoticon in a review.

I am intrigued! I like the outside narrator style when it fits, and it definitely fits here. Your writing is clear and concise, but casual enough to draw the reader in. I like how you describe the characters before getting into the story--I tend to picture what I read as a live-action movie, and this makes it a lot easier.

I did notice a few awkward grammar bits, specifically this chunk: "Not the oldest though, she is the middle child. Now Zenith who's hair contrast little Zadora. she with her hair pure shiny black that often seems blue and her eyes matching her little sister's." There are a few sentence fragments in here. I might change it to something like, "She is not the oldest, though, she is the middle child. Now Zenith's hair is very contrasting to little Zadora's. Her hair is pure shiny black that often seems blue, and her eyes match her little sister's." Also, in the next paragraph, you start two consecutive sentences with "her hair." I'm being a little nit-picky here, but it was slightly awkward to read. And about the fragments--if they were supposed to be that way, don't change them. I can't tell if you meant to do that or not.

On a final note, I like the alliteration in the girls' names--it goes nicely with the general tone. Keep writing, I want to hear more!

Okay, that was interesting. It's good that you're telling it the 'story telling' way.

But to give you some comments, it kind of breaks the flow because of the mentioning of 'the background' and the 'main character', etc. I don't think it's necessary for you to tell these things. People would eventually find out while reading. Especially, the background information thing kind of seems awkward.

"Though she is not the main character, she is the most important one. Because without her, nothing would have started."
I think this sentence would be better if it was changed to something like "You could either think that she had brought fortune, or misfortune," or something else.

And you should also delete the sentence about how appearances are important and stuff.

This is sort of the introduction, right? I mean, it's fine if this isn't the actual piece of writing, it's just a simple intro, but it might be annoying to some people when these things are included. I suggest that you write the story without a prologue thing. But then again, it's your choice, isn't it?

Anyway, I like your atmosphere. Without a lot of explanations, I kind of can picture how it's like in your book. You do a great job on the sentences, I have to say. It keeps the piece intruiging.
Continue, please! Really, you have talent on the atmosphere!