Simile:

Understanding: Similes make comparisons between things that are familiar and unfamiliar. By saying something is "like" something else, the poet helps the reader picture and understand the unfamiliar concept.

Feeling: Similes can evoke emotions by connecting the poem's subject to something that already has emotional weight. For instance, comparing a lonely person to "a shadow, stretching and thin" creates a sense of isolation and sadness.

Rhyme Scheme:

Understanding: A consistent rhyme scheme can help with memorization and recall of the poem's key ideas. By placing emphasis on certain lines through rhyme, the poet guides the reader's attention.

Feeling: Rhyme can create a sense of rhythm and musicality in the poem. This rhythm can be calming, exciting, or anything in between, depending on the sounds used and the poem's content.

Imagery:

Understanding: Vivid imagery uses descriptive language to create a mental picture in the reader's mind. This helps the reader visualize the scene, object, or person the poet is describing.

Feeling: Strong imagery can trigger emotional responses in the reader. For example, describing a battlefield with "smoke that stings the eyes and screams that pierce the ears" creates a sense of fear and chaos.

Working Together:

These elements become even more powerful when used together. A simile that uses vivid imagery can paint a clear picture in the reader's mind, while a rhyme scheme can make that image more memorable.  Similarly, strong imagery can be further enhanced by the emotional impact of a well-chosen simile.

By combining these tools, poets can create poems that are not only easy to understand but also evoke strong emotions and leave a lasting impression on the reader.