I’m much happier with this feather sketch than with others I made some time ago. The proportions are still off, (I didn’t leave enough room for the bottom portion of the quill), but getting better.
Getting close
I found this feather earlier in the week while hiking the Canyonlands Trail in Lakeway, Texas. My guess is that it belonged to a vulture (black or turkey vulture?). All the trails have signs about not removing any wood, rocks or any kind of artifacts, but I thought that as this fell from the sky and didn’t originate on the trail, I would claim it.
Vulture feather
It's a long story ... 
I have such a big black feather that I collected on a camping adventure from the banks of the upper Llano river with my son when he was 12 years old. He is now 53, and my feather in its spot in my workshop is still looking quite good.
My art thought today is that a drawing is not supposed to be a reproduction, but rather a new event representing an essence. Todays feather presented in your drawing is a feather in its own featherness. Congratulations.