Anna in the window?

This is the image I saw in the window tonight. It still creeps me out when I look at this.

I took it with my phone. It was the closest thing I could grab, b/c the last time I saw the image, it disappeared when I got up to look out the window.

I know it's Halloween and everything, but this is my backyard. There shouldn't be anybody back there.

And sometimes, when I look out the front window, I see a silhouette by the pine trees. I don't know if the light and shadows are playing tricks, but I first started seeing this shadow last week. Maybe I really am losing my mind.

But this can't be Anna. I don't believe in ghosts, but I don't know what this is.