The following youtube really hits the mark concerning what evil looks like. Evil is seductive, manipulative and subtle, it always has a hint of truth mixed in with lies. Always!
Perhaps you would be interested in a study about the serpent in the garden. I have found one that looks pretty good.
Because of certain events that have happened to my family over the last four years I have come to know evil with all its seductive, manipulating ways. I have seen the beautiful side of evil first hand. Evil whispers to you things that you want to hear. It recognises your vulnerabilities and works on them by building you up and telling you things that you think you need to hear. It flatters you, and you begin to trust it. It is intimate and you feel a deep connection with it. But when the scales fall from your eyes, and you see that it has been lies from the very start, you really understand how evil works.
How do we protect ourselves from evil? This video just touches on a few ways.
A feather wisps by and caresses the lips
What is this feather?
Does it want to speak?
Does it want to speak the truth?
A feather floats by and tickles the ears
A feather of praise
A feather of false flattery
This feather speaks lies