Head is enormous,
Wings are enormous.

I think the other body parts need some love and expansion.

-Extend Legs to the floor ( to make longer waist items )
-Extend Feet up by 8 blocks ( to make taller shoes )
-Extend Chest forward by 16 blocks, and backwards by 16 blocks ( to make more uniquely shaped models)

Blue is Max Head size, Red is max chest/arm/leg

fixed in the 1.16+