3D Hair 
Spike
Short
Long
Curly
Wavy
Ponytail
Bun
Bald
Braid/ Dreadlock
Afro
Band 
Hairstyle

Examples
They have spike hair. (3D Hair Spike) 
I see this person has short hair. (3D Hair Short) 
This person has stylish big hair. (3D Hairstyle) 

Make sure to sign the word before describing it in 3D. For example, sign the word "hair" before describing its appearance in 3D. ​