夜幕降临

• 亠(roof; upper part)ASSOCIATIVE
• 亻(person; human)ASSOCIATIVE
• 夕(evening; crescent moon)RADICAL

Night is when people bow their heads to rest under the moonlight of evening.

• 莫(empty; desolate)PHONO-SEMANTIC
• 巾(cloth; scarf)RADICAL

A stage curtain is a large cloth that covers the desolate empty space behind it.

• 阝(mound; hill)RADICAL
• 夅(descend; go down)PHONETIC

Going down from a high hill peak is the meaning of the character 降.

• 臣(downcast look; lowered gaze)RADICAL
• 品(many things/people; multitude)ASSOCIATIVE
• 丨(straight line down; vertical)ASSOCIATIVE

A person bending their eyes downward to look at many things below represents the meaning of "approach and look down."