Ghost Photo: Apparition in the Attic

This photo from Reddit’s r/paranormal reportedly shows a ghostly figure in the upper window. What do you think? From the original submission:
In 2002, my grandfather was moving out of the house my family had lived in for three generations.
Before officially moving out, he held a yard sale where EVERYTHING was out of the house. No kitchenware, no chairs, no tables, nothing. On the last day of the sale, when barely anything was left, one of my family members noticed a light in the attic window.
As you can see in the picture, it was a pretty cloudy day, and because of the sale, there was literally nothing in the house. No mirrors to reflect light, no lamps or ceiling fans. It was totally empty.
We’ve always thought it (the figure in the upper window) looks like a man in a suit with a bow tie. We found a picture of my great-grandfather on his wedding day and it looks pretty identical.”
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