Rhythm and Meter in La Belle Dame Sans Merci

In "La Belle Dame Sans Merci", John Keats subverts the traditional ballad form. Since traditional ballads are composed of four or six lines, and use one of two basic meters: 4-3-4-3 or 4-4-4-4. Insted John keats doesn't follow this since each lines finished before than expected. This makes the poem have a slower pace and this emphasizes the ending of the knight, alone and maybe dead. These are the variations in the rythm.
"La belle Dame sans merci" follows an iambic tetrameter. For example:
I made a garland for her head
And bracelets too, fragrant zone