Il a rasé ses cheveux. = He has shaved his hair.
Il a des cheveux rasés. = He has shaved hair.
You would say "cheveux lisses" in French.
As I assume you're taking about head hair it would be Mes cheveux sont... (beware, it's plural in french)
His hair is "ses cheveux" (masc.) in French.
To say "I don't have red hair" in French, you would say "Je n'ai pas les cheveux roux."
a hair bun is 'un chignon' in French.
Long hair is "les cheveux longs" in French.
ginger hair is 'les cheveux roux' in French.
'messy hair' in french is 'cheveux en désordre'
You can say "Il a des cheveux gris" in French to mean "He has gray hair."
ils/elles ont les cheveux roux
les cheveux
Coiffeur