I have not done many turkey feather art projects, but I had an opportunity to do a couple recently. The process is to clean the feather of any oils or dirt. The second step is to use a fixative or flat varnish spray on the feather. This helps keep the paint stay where I put it. This process, also, works to keep the barbules stay tight and not spread open.
Once these steps are completed, I can decide on a composition image and begin to paint. These two examples were completed in acrylic paints. Once dry I spray a light coat of satin varnish to further seal.
I hope you enjoy these two images.
Larry A. Smail's Blog 
Hi Larry,
I would be proud to own one of those if you are considering sale.
Thanks, John
John, Thank you for your interest. The two feathers on the blog site are no longer in my possession. However, if you still wish one, I could paint another. I ask fifty dollars plus ten dollars for shipping. Let me know if still interested and thank you.
Sounds good to me. I am in no rush, this is a busy holiday season.
John