American Sign Language: "WH question" Facial expression.

You should lower your eyebrows when asking a question to which there is a more than a "yes" or "no" answer.  This expression is typically used for questions using the signs: WHO, WHAT, WHEN, WHERE, HOW, HOW-MANY, and WHY.

"WH" question facial expression:  "eyebrows down."
Here I'm doing a version of the sign "WHO?"

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Note: The "WH question" facial expression is one of many "nonmanual markers" (NMM) used in ASL.  For more information, see:  Nonmanual Markers (NNM)
Also see: "Yes/No question facial expression"