The painting boss is Trauma (and the mini-me Dromas) with Pulse Cannon attacks. They are considered partially living weapons of future but there's not much information on them beyond that.
I can see how that could apply to a more literal interpretation, but I don't see how the Garden part fits in.
[Edit] Oh wait, the painting itself could be considered the Garden Trauma is sleeping in.
Still, I like the allegory better.
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