Agree with Dunster only take it a step further with that diamond filled with curved crosshatching. Curved crosshatch would also fill those triangle units quite nicely. You need to get a curved template for that though. I would not attempt it without using the curved crosshatch ruler template. I have Ronda's ruler sold at Quilters Rule. I have the medium and the large crescent as well as the large double S (which I have yet to use).
http://www.quiltersrule.com/template...dasRulers.html
Edited to add, you feathers are beautiful and look great on this Carpenter's star.