When a person in a photograph consistently has the same expression. They believe that this is the only way they look good in a photo, thus every photo of them looks exactly the same. This type of photo is typically found on a facebook profile.
"Wait, wait... don't take the picture yet, I don't have my picture face on."

"Try to snap a candid photo - one without her picture face."
by Spygirl3000 March 7, 2009
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October 20th is National Half-Face Picture Day, send your contacts a picture of half your face!
John: “Hey send me a picture of Half your face!”
Stacy: “Why”
John: “Today is October 20th, it’s Half-Face Picture Day”
by Mr. Half-Face October 20, 2020
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