Whaley House Ghost

I took this photo this past March at The Whaley House in Old Town, San Diego. This was my first time visiting the house. The bright light on the upper left side is from the flash on my camera, but I've circled what I can't explain. I have no idea what this is. Could it be a spirit? What do you think? I just thought I'd share this pic with you all. Also, this was the only pic that came out blurry!