First, I will break down the anatomy of the duck lips:
To do this, it requires the flexing of muscles around the mouth in order to purse the lips..
Side view
The complete look also requires a certain look for the eyes. Lets say, for now, the face requires looking straight into the camera.
You can alter the expression of the eyes from neutral, as shown above, or slightly annoyed.
As I was practicing my best duck lip face, I realized that it is not an easy face to make....I rarely use my mouth muscles in this way, and I hazard to say that making a really good one takes some practice. You might end up looking bewildered:
or just completely silly, resulting in a failed duck lip face:
After this research was completed I realized the face is very similar to the look of sipping a hot cup of coffee or tea.
As the face-making continued, I started to get "better" at making the face and started adding props.
Note the third and final element of the standard duck lips selfie, the extended arm.
Please check back soon as I continue to investigate the elements of this far-reacing face.