COUNTENANCE
Literally, the contents of a body; the outline and extent which constitutes the whole figure or external appearance. Appropriately, the human face; the whole form of the face, or system of features; visage.
The face as an indication of mood, emotion, or character. The appearance conveyed by a person’s face. A person’s expression. A look on a person’s face that shows one’s nature or feelings. A look of approval on the face. A look or expression indicating encouragement or moral support.
Favor; good will; kindness.
Thou hast made him glad with thy countenance. Psa 21.
Hence in scriptural language, the light of Gods countenance is his smiles or favorable regards, his favor and grace; and to hide his face or countenance is to manifest his displeasure, and withdraw his gracious aids. So the rebuke of his countenance indicates his anger and frowns. Psa 80.
Your composure reveals your countenance. Your manner lays bare what is hidden within your inner regions.
5 but He did not respect Cain and his offering. And Cain was very angry, and his countenance fell.
6 So the Lord said to Cain, “Why are you angry? And why has your countenance fallen? 7 If you do well, will you not be accepted? And if you do not do well, sin lies at the door. And its desire is [d]for you, but you should rule over it.”