I chanced upon a feather
In a nest of snow,(loved this)
An eloquent whorl(and this)
that unwound into a downy quill, (you set up a good rhythm at the beginning)
so like the half shape of a heart. (but lost it here)
I gave my breath to lift it
but could not set it free.(back on rhythm here)
Perhaps, clasping solitude,
This cameo of frost
cared not for the whistle of the wind (lost it here)
But for the echo of the breast
that beat there no more. (Rhythm is almost gone here)
I chanced upon a feather
du du du du du du-du
In a nest of snow
du du du du du.
See what I mean? This is why I liked some of it and didn't like others. This doesn't mean your poem's not good. This is just ONE opinion. If you like it then it's fine. But like has been said to me in the past. "Who are you writing for?" If this is solely for you, then it's fine. But if you want to be read and liked then you have to work harder to make any connections, so that people will 'feel,' your words. Do you see what I mean? Keep going. You're doing fine. xbx