What are some examples of images in Song of Myself section one?

The first image in this section is an image that will recur through the rest of the poem: "I lean and loafe at my ease observing a spear of summer grass" (5).  The speaker's observance of this "spear" of grass (which is an unusual word--normally, one would say "blade" instead of "spear" of grass) gives him the moment to consider Nature's connection to humanity, because afterward, the speaker comments on how "My tongue, every atom...

The first image in this section is an image that will recur through the rest of the poem: "I lean and loafe at my ease observing a spear of summer grass" (5).  The speaker's observance of this "spear" of grass (which is an unusual word--normally, one would say "blade" instead of "spear" of grass) gives him the moment to consider Nature's connection to humanity, because afterward, the speaker comments on how "My tongue, every atom of my blood, form'd from this soil, this air, / Born here of parents born here from parents the same, and their parents the same (6-7).  Whitman sees in this one piece of grass the connection of humanity throughout the ages, through generations of people who have come before him and who will come after.  Again, this is a theme that will continue through the poem.

The other image that is consistent throughout the poem is the speaker himself: "I, now thirty-seven years old in perfect health begin" (8).  This poem is like an autobiography of sorts for Whitman, and he is beginning of journey, "Hoping to cease not till death" (9), which is reminiscent of the Transcendentalists.  Through this poem, he hopes to discover something about himself before he dies, and he is hoping that Nature will give him the answers.