“Our faces are a little out of focus.”
You're showing your vacation photos to a friend. One of the photos isn't clear, so you comment on it.
Our faces are a little out of focus.
When you take a photo, some parts of the photo may be "out of focus". This means that those parts look blurry because of how the camera's lens was set.
The opposite of "out of focus" is "in focus":
Make sure that my face is in focus.
And the verb "focus" means to set a camera so that the subject is clear:
How do you focus on this camera?