One of the reasons I picked the design I did is there was minimal marking needed. I marked the spine using a french curve. I also marked the center line for where the feathers would meet in the middle. Finally, you can’t see it in the picture, but, I marked the corner points for the continuous curve. I marked one row at a time. It only took about 5 min to mark a whole row.
Now to put feathers (and curves) to fabric.
Each block took 2 passes. one pass for the continuous curve and one pass for the feathers. I used a dark cream thread. Its a little visible on the dark green and dark red fabric, but it blends nice on all the other fabrics.