test picture 

A picture you temporarily post on your profile to get a good idea of how others will respond to it, before making the photo widely viewed.

I put up a test picture on Facebook, but no one commented on it, so I won't make it my profile picture.

test picture by M.J.S.S January 14, 2010

picture test 

on a dating/social media site, what others think of and how they perceive the selfie on your profile.

what is it to Louis XIV if i passed someone's picture test and they messaged me or not; beauty is in the eye of the beholder when we meet in real life.

picture test by Uncle Dimma October 10, 2014