Very traditional styling of Haiku.
I know how hard that is to compose!
Introduction of the Sand Hill Crane at the end, is both the
nature element, and possibly the seasonal element
(as I think you allude to their migration).
The only correction that I would suggest is to replace
the three dot ellipsis with an M dash
(although it will still show up as two dashes in WdtC)
An ellipsis is usually a sign of incomplete thought, or missing words.
Traditional Haiku would need each line to stand alone,
although a cutting symbol is allowed such as M dash.