What is it about the phrase "like the night" that immediately draws the readers into Lord Byron's poem "She Walks in Beauty?"
Honestly, this is a hard question to answer objectively (based on facts rather than feelings). Interpreting poetry is rather subjective (based upon personal feelings or emotions). Therefore, universally defining how the phrase "like the night" (from Lord Byron's "She Walks in Beauty") draws readers in is somewhat difficult.
This said, the simile Byron immediately creates can draw readers in. Some may be intrigued by the comparison of a woman to the night. For some readers, they may not understand how a woman woman's beauty can be determined when it is night. It takes reading on for the reader to see that the stars are lighting up the woman and her beauty.
For others, they may see nothing engaging in the phrase "like the night." They, most likely, will fail to become engaged and read deeper into the poem. The simile will exist as a simile and nothing more.