The Selfie

There’s no better way to accurately gauge your strength training progress than photography, but a selfie falls short. Since full-body selfies are taken in a mirror, that’s what you’re seeing — the same view you see in the mirror.
To more accurately track your progress, enlist a friend, or put your camera on a tripod (or ladder or table or other stationary resting place), set the self-timer and standing in front of a plain wall, take straight-on shots from all four angles: front, back, left side, right side.
A month from now set up the identical situation (especially the same lighting, whether natural or artificial) and repeat.
Lots of before-and-after photos used in ads to sell you products or services are rigged by changing the lighting, having the subject tense their ab muscles, taking the photo immediately after a workout so that the subject has a pump, etc.
Keeping your chosen photo set up the same from photo shoot to photo shoot will allow you to accurately gauge your progress.
On the other hand, when taking selfies for social reasons, you’ll want to show yourself off at your best, so do whatever it takes to create the most flattering shot.