Why would a male ostrich feather need to be so beautiful?
Why is a sunrise or sunset so beautiful.
I would say God's glory is baked in creation and those things give a small hint of that glory.
Rich Mullins sings about this
No, I don't think the world or the heavens reflect the glory of any deity, first because along with the beauty, there is much ugliness, pain, suffering, injury and death (including the extinction of entire species). "Paradise", if such ever existed, should never have been "lost" by the mismanagement of a flawed Creator.
In my view, God is real, but is not a creator or an intervener. As a panentheist, I believe that God is "here" (immanent) and "more than here" (transcendent). Because God is not a creator or intervener, God cannot be praised for the world's beauty and goodness, and God cannot be blamed for the world's ugliness and evils. In my view, God is off "the theodicy hook". A theodicy is a model that attempts to explain and justify the existence - and more important, the persistence - of evil in a supposedly good creation that was constructed by a good Creator.
Nothing in the world testifies to a Creator - not the good, the bad, the ugly or the indifferent.