What a great idea for a topic. I'm surprised no one else has replied!
I like your poem. It's simplicity is attractive, and while the imagery is "harmless", I can hardly think of a controversial way to describe blackberries.
I have a poem of my own I'd like to share. I know poems are supposed to be interpreted in your own way, but I'll have to give you something to go on as it's part of a larger story: it's about an old mechanic who takes in hurt animals and builds them new body parts - which later turns into a grotesque, violent obsession.
Sway within reach,
The flutter of jays,
To sleep and beseech,
Less tiresome days
By gun or by cub,
The bickering doves,
In love all the same.