'dusk sky' is a correct and usable term in written English.
You can use it to describe the sky during a specific time of day, typically when the sun is setting or in the moments leading up to nightfall. For example: "The sun was setting, and its light illuminated the dusk sky, creating a beautiful ombre of purples, blues, and reds."
Here "the jackdaws were watching, silhouetted against the dusk sky", witnessing the crimes of human predators.
WEDNESDAY One evening when he had just turned 2, C proclaimed "half moon up!" at the half moon rising in the dusk sky.
And a startling 80% drop across England in 40 years has diluted the shifting Rorschach blots painted on the dusk sky by massed flocks of starling - though urban changes are blamed for this too.
The Pass is also a great spot to enjoy a sunset walk to Main beach where you'll see a spectacular dusk sky behind the spectacular crag of Wollumbin (formerly Mount Warning) and the surrounding hinterland that hems the region.
The imminent arrival at the Arc de Triomphe of this arresting amorphic and whirring mass was heralded by the sound of helicopters, a cacophony of horns from the race outriders and VIP cars, and a wonderful seven-strong air force fly-by that left patriotically coloured plumes hanging in the dusk sky.
Dawn and dusk sky are blue on Mars and day sky is red.
The voices were the equivalent of a compass star in the dusking sky.
They looked like stardust or granulated dusk-sky colored light… Fantasia… the dust of so many comets!
Moreover, the expression 昏天黑地 hun-tian-he-di "dusk-sky-dark-earth" in 11a describes the resultant drunk state of the agent of the verb 喝 he "drink," and therefore, it is an agent-oriented secondary predicate.
At dusk the sky cleared and the temperature plummeted.
At dusk, the sky above the flat, featureless buildings on Edgewater Drive turned dark purple.
