I think this game needs more realistic and detailed hair textures and animation.
The hair currently looks a bit flat, the shading looks odd, and the colors/texture slightly changes based on style. It's not animated based on a character's movements or at all.
Instead the hair should be animated with realistic physics. The hair color/texture should not change with different hair styles. Better quality texture rendering with shading and highlights. Also make different hair styles with different textures that have different lighting effects.
The super curly hair styles the shading is dark and weird looking so why not lighten that up a bit and make the ends more translucent.
Also add in much more hair colors including more natural colors and dye colors. Add in a 2nd hair color option for shading. The first one will be base hair color.
Like what guild wars 2 and some other games have for their hair physics and textures.