Nan's Ghost Picture

OK, we don't know how to respond to this awesome ghost picture, as it looks like a lengthened exposure. The problem is that it cannot be a lengthened exposure, because no one else was in the room with the photographer. So do we have an apparition here? You decide...

"I don't know what a lengthened exposure is, but this pic was taken with my mobile (phone) at my Nan's. When I got a bit bored, I just took a few pics and this was on it. But if you zoom in, it looks like there are arms and even a face...and there was no one in the room at all - just me."

"I promise you there was no one in the frame or in the room.  Some people say it's my mum who passed away a few years ago."