It’s quite simple. Either you know how to wink or you don’t as the act is an art and only comes naturally.
Here is a good example:
“He opened the door wider. ‘He's waiting.’ He gave me what was probably meant to be a significant wink, but a corner of his mouth moved more than his eye did and the result was a fairly startling face” writes Dashiell Hammett in ‘The Thin Man,’ explaining quite eloquently how a simple wink go all wrong just by a wayward muscle.
Seeing the comparison above, the point becomes pretty clear. In case it isn’t, check out the following ladies trying their hand at winking and let us know which ones have what it takes and which need more practice.