Hello there!

I wrote a horror chapter for my next story, but I am quite inexperienced with it to be honest. So I was looking for some feedback if I am doing it right, or at least going into the right direction with it. 
The scene takes place at an abandoned Canterlot Castle, it is 9 pages long and in a google doc. I am not a native speaker so the wording and grammar may be a bit off sometimes, but I want to get sure I wrote something that is worth editing before I bother my editor with all the work.