9. And now - rinse and repeat for all the remaining layers! Keep in mind that the small feathers will definitely have their middle lines positioned differently than the large feathers at the end of the wing. The small ones usually require less lined detail as well, 'cause there simply isn't that much space on them, and their size alone creates a more detailed impression.
Well that's about all. If you have any questions, please post them in the comment area. Good luck and wind to thy wings! ;)