This shows how I broke down the dragon plume
on the Black Knight's helmet into separate parts, because when I'll make it as a papercraft part, it will be much easier this way than making it as one hollow piece.
Basically, you have the main body, and everything that's thinner
(like the tail tip, tail spines and the beak) and everything that's thicker
(like the wings) are separate pieces that will be assembled and glued on separately: [link]