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[Semicircle]

Hey semi-
Some good images in this one. Comments below:

On this midsummer's day,
sun beams on this sunken shack, maybe "through a" instead of "on this"
over the silhouette of cock weathervane  "over " confuses it. Maybe "a cock"- move "weathervane" to the next line
covered in plaque"plaque" is a forced rhyme, and does not work.  Makes me think of teeth. You gotta find another way to describe the weathervane. Or maybe just "weathervane, out back", as in the silhouette/shadow of the weathervane is out back, behind the shack.

Bark fence, I've seen old wood fences- "bark fence" is hard to picture, for me
gate makes a sigh I love the gate sighing. Maybe "old gate opens with a sigh"
dead yellow jackets
in the kiddy pool. the image of a kiddy pool seems out of place in this scene, for me. Maybe another way to describe the pool.
Grass overgrown, dry.

Bent stake in the ground
leash still attached. cool. An adjective to describe the leash would help.
Empty nest in the branches The nest can't be empty if eggs are in it. You need a different adjective to descibe the nest.
with the eggs all haven hatched. Maybe just "eggs never hatched"

How's that? Changed the pool with a bird fountain which I think fits better.