This idea is very basic, and I'm not sure it can be successful in its current form. As simply an item that kills people (with added danger to ensure that it can't just be locked in a box and left alone) it is too heavily influenced by early site tropes, and I don't think that the audience is up for more of that, without bringing something new to the table. The inclusion of a transcript that just blandly restates the effect we already know about is also a lacklustre ending.
In addition, you will need to work hard on your written English to succeed on the site. There are a number of grammar and tone errors ("at any times", "average size D-Class", "pristine piece" etc) and capitalisation and punctuation errors, particularly in the first paragraph of the Description. Also, consider the logic of your writing - is a mirror likely to have a depth of 2m? Why would the Foundation bring a mirror in if it didn't know what its anomalous properties were?
But getting the story right is the first step. What is it about mirrors that made you choose this one? Why did you decide to add the ability affect images? Let's try to break down the core fears behind this idea, and then perhaps we can use them to craft a novel take which might have more chance of success.
