I'm a photographer. That kind of photo is pretty easy to get by using a longer shutter speed and the flash. The light near the top of the stairs and the blur on the wall make me think that's what happened. There is a face kind of over her face that isn't her, but someone walking by while a photo is being taken can have that ghosting effect because of the motion. Maybe they paused for a second or something.
Don't get me wrong, I think it would be very cool to see a legit paranormal photo. But most photos are taken at night/in the dark, and I think the majority of them can be explained by motion blur and dust/bugs.
I think it's good to post photos, even when they don't turn out to be paranormal. For one thing, I think it's good to approach everything with a healthy bit of skepticism, because a lot of things can be explained by something natural or camera function/operator error. And another, you learn a thing or two, which is always good.