I saw the picture before reading the notes and whatnots and my first thoughts were: "Slasher Snarry? Severus is hiding behind a dissolving wall while Harry lurks in the background, blood-red sword in hand. Okay, maybe not slasher Snarry. Maybe murder/revenge Snarry?"
My mind goes to some real dark places sometimes.
I do love the tendrils along the border of the vision and under Harry's feet. The sword design is pretty bitching. And Severus... there's so much emotion in his face and body language. A lot of exhaustion, but a bit of wistfulness as well.