Step 1: Apply your base colour, I'm using 'Slate Grey' by Models Own
Step 2: Using a small thin brush (like the one pictured above) and white acrylic paint, draw lines for the centre of your feathers
Step 3: Using the same brush and acrylic paint, put a small amount of acrylic paint on your brush, using a light flicking motion work your way out from the centre of the feather, this will also allow any excess paint to blend into the 'stem' of the feather rather than clogging up the design. Be gentle and repeat this for all of your lines.
Step 4: Clean up using an old paintbrush and acetone and then apply your topcoat, I used Seche Vite.
I hope you enjoyed this, let me know if you try it out (if you're on Tumblr I track the tag 'onenailtorulethemall') and let me know if you want to see any other tutorials :)