a nice positive poem with strong, thematic, imagery.
I wonder if you have considered making the opening 5 lines, so that the stanzas match in length (line 5 would be my suggested cut), and also a tweak to the opening line in stanza two so you have the repetition carried through all 4 opening lines.
tweaking the 1st & 4th lines of stanzas 3 & 4 so they aren't identical would also keep the feel of the whole poem moving in the same direction - or making stanzas 1 & 2 have a similar opening and closing line.
anyway, just a few suggestions. good work
I try to stay some what free verse but these are excellent suggestions.
If there hadn't been the repetitions there already I wouldn't have suggested adding them in.
The bones of structure are already right there, you might find the exercise an interesting one to potter with.