strange

STRANGE:

STRANGER:  The concept of "stranger" or someone that you don't know can be expressed by signing "NEW + AGENT."

You can also sign "STRANGE + AGENT" to mean stranger.  But, if you are using this sign to mean "someone you don't know" I wouldn't use the "strange"  facial expression.  I'd use a normal expression.  If you are using this sign to mean some new weirdo in your life, then by all means, go ahead and use the facial expression.