In "when we two parted," which literary device is byron using with his use of sensory details such as "colder thy kiss," "chill on my brow," and "a shudder comes o'er me"? question 3 options:

Byron used “imagery” as a literary device in these examples.

For the lines

Pale grew thy cheek and and cold,

Colder thy kiss

alliteration have been used. The technique is used for the letter sounds of k and c.

For the lines

The dew of the morning  

Sunk chill on my brow—  

It felt like the warning

Of what I feel now.

there is a regular rhyme scheme for the words brow-now and morning-warning. Additionally, the author applies foreshadowing to the lines.

The lines  A shudder comes o'er me—  indicates a metaphor how the main character feels towards his love.  

Overall, the the lines focus on the language of sensory description of a physical intimacy.