How are sensory images and details used in "Birches"?

In "Birches," Robert Frost effectively uses images and sensory details in juxtaposition with the speaker's thoughts and ideas to create the poem's overall memorable impression. What he omits is sometimes equally important.
He immediately establishes the sensory importance: he describes what it looks like "When I see birches ben" and also describes the "straighter darker trees." He assumes the reader knows the birches are white, so he doesn't have to say that. Not until near the end does he actually mention white, reinforcing the contrast with black.
He immediately moves to speculation, drawing attention to movement and inserting human agency into the natural scene: the "bend" of the trees is compared to "boys . . . swinging." Now we can't unsee the boys, even though they are not present. Those boys recur as an image in the poem, and Frost reminds us of them, again visually: "you must have seen those boys." Later, we learn that the speaker is one of them, "a swinger of birches." The concrete action, now transformed to a passive characterization, is clinched by the last line, inclusive of all readers: "One could do worse than be a swinger of birches."
Throughout the poem, Frost sustains this technique of encouraging the reader to identify with very specific sensory images, such as the face burning and tickling. He also includes auditory images, such as describing how the branches click when iced up.
While almost the whole poem is about boys, Frost brings in girls for a definite contrast, with a simile full of sensory information: "leaves on the ground like girls on their hands and knees." The groundedness is contrasted repeatedly with mentions of upward and outward motion and energetic actions. The boy makes the branches move up and down: "riding," "climbing," "launching," "carrying," "kicking."
The nostalgia of the speaker for this time of youthful energy is strengthened by the sensory specificity in describing swinging the birches and his dominant role as he "subdued" the trees. There is a marked contrast to the negativity and passivity of being in the "pathless wood," where the trees were not his allies and even made him cry.
Using the senses in combination with drawing in the reader and evoking emotional states, Frost creates an unforgettable masterwork.
https://www.poetryfoundation.org/poems/44260/birches

"Birches" is one of Frost's best-known early poems, and features a number of vivid sensory images and details. One particularly strong example is the section wherein Frost describes the experience of pushing through life like a "pathless wood", where "your face burns and tickles with the cobwebs / Broken across it, and one eye is weeping/From a twig's having lashed across it open." The image here is multifaceted: Frost evokes the reader's memory of similar experiences by including multiple details of how this situation would feel. The cobwebs across the face are one element; the description of the twig lashing across the eye makes the readers own eyes almost "weep" in sympathy. Frost puts together a visceral mental picture by drawing upon sensory experiences all of us have had, in order to help the reader place him or herself in the position Frost describes. 
https://www.poetryfoundation.org/poems/44260/birches