Something else to consider is that the brain is programed to matrix. When we look at things our mind looks for familiar shapes and then puts them together, usually making people see faces where there really aren't any.
It is creepy, the girl looks semidemonic, or maybe she's just pissed off, who knows.
If you're freaked out why not do some research on the house and see who else has lived there and possibly died there. Otherwise, don't worry about it.