B&A: What do you think of my story so far?

This is great; the first sentence hooked me. A couple suggestions. Your use of the 'river' to describe the veins is very strong and original. But a few sentences later you repeat the word 'river' when talking about scars, and that repetition weakens what should be a strong impression. See if you can find another word that allows you to use the image but without lessening the impact of original writing. There are a few grammatical errors but those you'll fix in editing. I'd also suggest losing the word 'suddenly'. That can be seen as a word used by beginning writers, and it 'cheapens' the writing. If you want the door to open unexpectedly, shattering all this whiteness, have it slam back, or something like that, that shows the suddenness, rather than you telling the reader the door opened suddenly. Great job, and good luck with this.