Where is imagery used in The Road Not Taken?

Imagery is used throughout the poem, The Road Not Taken, by Robert Frost. Some good examples of this are: Two roads diverged in a yellow wood, and sorry that I could not travel both, and be one traveler, long I stood and looked down one as far as I could to where it bent in the undergrowth.

Other descriptive words include: 'grassy and wanted wear', 'in leaves no step had trodden black'