There's a lot of conflict in the imagery in this poem (I think that's a very good and intended thing, but I could be wrong). The only imagery is the dust, the wind, the leaves, and the sun (and maybe the bugs)---all things that harrass you physically, though you defy them. You attribute intention to them, which I like---I'm not sure I see why the leaves are "terrified," but the rest of the poem manages to be very successful.
I did enjoy reading this. Thanks for contributing to this quiet little forum.
"God becomes as we are that we may be as he is." ~William Blake