does it give the sky human traits
no
Yes, "under the jewelled sky" is an example of personification because the sky, an inanimate object, is described as having the qualities of a jewel, which is typically associated with beauty and value. This personification adds an element of vivid imagery and enhances the poetic quality of the description.
The star was twinkling so that is the meaning of the jewelled sky. This means that the sky was full of shimmer and glittery star. It shows that it was a romantic night for the Highwayman as he is going to visit Bess.
Yes, "the sky is low" is an example of personification, as it gives human characteristics (being low) to the sky.
The dark sky was angry and resentful.
metaphor
The sky roared with anger!
Uranus (Ouranos meaning "sky" or "heaven") was the personification and god of the heavens/sky.
Caelus, the personification of the sky.
personification
In the darkness the moon smiled in the sacred sky
Sunlight smiles in the sky (also alliteration :])
Jewelled Nights was created on 1925-10-24.
Métaphore