I decided to just fix the back feathers by rounding the corners, instead of unstitching them. It is somewhat better.
The side feathers were done with 1/2 strand of light yellow Japanese flat silk. It turned out really fine and fluffy.
Then I decided that he was too skinny, and needed a rounder tummy. Here's the final version - I'm going to name him Kenny. I will review him tomorrow and see if anything else needs to be done.
I am done with doing birds for now.